Answer · confidence: partial
Did any time capsule makers plan a future reunion, and what happened that day?
Research question: Were any time capsules sealed with a plan to hold a reunion or open event for future visitors, and what happened when that day came?
Yes, several capsules were tied to a future reunion or public opening. The clearest completed case is Sioux Falls, where former Mark Twain Elementary students gathered at a reunion half a century after burying a capsule in 1976 1216. A North St. Paul capsule carried a 2026 dig-up date, but the records do not say it was sealed for a reunion 30; when opened, it had been sitting in water and its contents were not preserved, so volunteers rebuilt a display from copies and county records 3132. Even so, the June 25, 2026 community reveal drew a line out the door for most of the evening, and organizers called it a success 33. For the Rolette and Kaukauna capsules, the records show only plans, with no report of whether those openings happened 1427.
Checked 2026-10-21. Only documented and supported facts are used.
Dig deeper on this questionSources
[1] supported
A Plymouth Prowler was buried as a time capsule in a concrete coffin for Tulsa, Oklahoma's 100th anniversary celebration in 1998, and its opening is planned for 2048.
"Zur 100-Jahr-Feier der Stadt Tulsa , Oklahoma im Jahr 1998 wurde ein Prowler als Zeitkapsel in einem Betonsarg vergraben. Dessen Öffnung soll im Jahr 2048 erfolgen."Plymouth Prowler
[2] supported
A time capsule was walled into the foundation stone of the Christuskirche in Hamm when it was laid in September 1901. It contained a certificate on the church-building project, copies of the Westfälischer Anzeiger and the Evangelischer Gemeindebote, and some coins valid at the time. The document does not say the capsule was meant to be opened or to be revisited at a future event.
"In den Grundstein wurde eine Zeitkapsel mit einer Urkunde über die Geschichte des Kirchbauvorhabens, je einem Exemplar des Westfälischen Anzeigers und des Evangelischen Gemeindebotens sowie ein paar damals gültigen Münzen eingemauert."Christuskirche (Hamm)
[3] supported
A time capsule was walled in during the cornerstone laying of St. Michael's church in Saarbrücken, which took place on 3 June 1923. The excerpt cuts off before saying what it contained, and it does not mention any plan for a reunion or opening event.
"Bei der Grundsteinlegung wurde eine Zeitkapsel eingemauert, in die"St. Michael (Saarbrücken)
[4] documented
The time capsule was intended to remain sealed until the year A.D. 6939, at which point it was hoped people would be capable of discovering and raising it.
"But if, as is our hope, it rests untroubled until the year A.D. 69 39, there may be people capable of discovering and raising it, of reading and studying the contents."The book of record of the time capsule of cupaloy, deemed capable of resisting the effects of time for five thousand years, preserving an account of universal achievements, embedded in the grounds of the New York World's fair, 1939 (1938)
[5] documented
The capsule was explicitly marked with a warning that anyone finding it before A.D. 6939 should not disturb it, as doing so would deprive the people of that future era of its contents.
"IF ANYONE SHOULD COME UPON THIS CAP- SULE BEFORE THE YEAR A. D. 6939 LET HIM NOT WAN TONLY DISTURB IT, FOR TO DO SO WOULD BE TO DEPRIVE THE PEOPLE OF THAT ERA OF"The book of record of the time capsule of cupaloy, deemed capable of resisting the effects of time for five thousand years, preserving an account of universal achievements, embedded in the grounds of the New York World's fair, 1939 (1938)
[6] documented
The document requests that the time capsule rest in the earth until its designated time and that no one dig it up for curiosity or any other reason in the intervening years.
"We likewise ask : let the Time Capsule rest in the earth until its time shall come ; let none dig it up for curiosity or for any other reason. It is a message from one age to another, and none should touch it in the years that lie between."The book of record of the time capsule of cupaloy, deemed capable of resisting the effects of time for five thousand years, preserving an account of universal achievements, embedded in the grounds of the New York World's fair, 1939 (1938)
[7] supported
A time capsule deposited in 1905 at the Arlington National Cemetery was opened on April 9, 2020.
"Apertura de la cápsula del tiempo depositada en 1905 en la capilla inferior del Anfiteatro Conmemorativo del Cementerio Nacional de Arlington, en Arlington, Virginia (9 de abril de 2020)."Cápsula del tiempo
[8] supported
The Crypt of Civilization, created in 1936, is scheduled to be opened in the year 8113.
"La Cripta de la Civilización de 1936, cuya apertura se programó para 8113, está considerada el primer intento moderno de crear una cápsula del tiempo."Cápsula del tiempo
[9] supported
A time capsule buried in 1937 for the New York World's Fair was intended to remain sealed for 5,000 years, until the year 6939.
"En 1937, durante los preparativos de la Exposición Universal de Nueva York de 1939, se sugirió enterrar una “bomba del tiempo” durante 5.000 años (hasta 6939)."Cápsula del tiempo
[10] supported
In 2006, Yahoo! and artist Jonathan Harris collected digital content from users worldwide to be released to the public in 2020 to commemorate Yahoo!'s 25th anniversary.
"En el año 2006 el sitio web Yahoo! en conjunto con el artista Jonathan Harris ha recopilado fotos, videos, textos y audio en formato digital provistos por usuarios a lo largo del mundo, para que sean vistos leídos y escuchados en el año 2020, cuando Yahoo! coloque a disposición del público en su sitio, conmemorando su 25to aniversario, todo el material digital guardado 14 años antes."Cápsula del tiempo
[11] supported
A time capsule project in Barcelona, initiated for the 150th anniversary of the city's urban reform plan, is scheduled to be opened in the year 2159.
"Barcelona2159.org (Cápsula impulsada por el Año Cerdà en el 150 Aniversario de la aprobación del Plan de reforma urbanística de Barcelona, se abrirá en el año 2159)"Cápsula del tiempo
[12] supported
A time capsule buried in 1976 by students of Mark Twain Elementary was opened at a reunion half a century later at Susan B. Anthony Elementary School.
"What started as a school project in 1976 turned into a reunion half a century in the making on Wednesday at Susan B. Anthony Elementary School."Do you remember when? Digging up 1976 in Sioux Falls
[13] supported
The Crypt of Civilization was sealed with a plan to be reopened in 8113 CE, about 6,177 years after its creation.
"proposed the creation of a Crypt of Civilization to be opened in 8113 CE after another 6,177 years."Crypt of Civilization
[14] supported
A time capsule buried at Westland Cemetery in Rolette in 1976 is scheduled to be opened at the 2026 Rolette Pioneer Families Reunion, marking the 50th anniversary of the original reunion. The article is a preview, so it does not report whether the opening happened.
"the opening of a time capsule buried at Westland Cemetery in Rolette"Time capsule, sculpture highlight pioneer reunion - Minot Daily News
[15] supported
After the Space Shuttle Challenger explosion, citizens of Palm Harbor buried a time capsule in 1987 at H.S. "Pop" Stansell Memorial Park, filled with space memorabilia including letters from President Ronald Reagan, Vice President George H. W. Bush, and Senator John Glenn.
"After the Space Shuttle Challenger explosion in 1986, a group of citizens of Palm Harbor buried a time capsule in 1987 at H.S. "Pop" Stansell Memorial Park filled with space memorabilia including letters signed by President Ronald Reagan , Vice President George H. W. Bush , and Senator John Glenn to memorialize the disaster."Palm Harbor Museum
[16] supported
Former students gathered to open the capsule they had helped bury 50 years earlier, reconnecting with classmates and rediscovering memories.
"Former students of what was once Mark Twain Elementary gathered to open a time capsule they helped bury 50 years ago, reconnecting with childhood classmates and rediscovering memories frozen in time."Do you remember when? Digging up 1976 in Sioux Falls
[17] supported
Oglethorpe University sold metal cards to the public for one dollar, each permitting a future descendant of the contributor to attend the reentering of the crypt.
"Metal cards were sold to the public by the university for one dollar, which would permit a future descendant of the contributor to attend the reentering of the crypt at noon on"Crypt of Civilization
[18] supported
The 1976 time capsule was scheduled to be ceremonially removed and opened on the first day of the 2026 reunion, with registration.
"The reunion officially kicks off Friday, July 10, with registration and the ceremonial removal and opening of the 1976 time capsule, followed by an evening dinner and entertainment."Time capsule, sculpture highlight pioneer reunion - Minot Daily News
[19] supported
The citizens, led by George Fatolitis, gave the time capsule to the Palm Harbor Historical Society, planning for it to be opened in 50 years, resealed, and reopened 50 years later. The document does not say what happened when the first opening was due.
"The citizens, led by George Fatolitis, left the time capsule in the hands of the Palm Harbor Historical Society to open in 50 years, rebury, and then reopen 50 years later."Palm Harbor Museum
[20] supported
Inside the 1976 capsule was a hand-drawn, detailed map of the school created by former student Dan Hanson, who said he drew it because he thought the school might become much bigger.
"One of the most personal items inside was a hand-drawn, detailed map of the school created by former student Dan Hanson."Do you remember when? Digging up 1976 in Sioux Falls
[21] supported
Frank G. Menke asked singer Bing Crosby to be Master of Ceremonies at the 8113 CE opening, and Crosby said he would be glad to if his filming schedule allowed.
"newspaper reporter and historian Frank G. Menke asked the movie star singer Bing Crosby to be Master of Ceremonies at the opening of the crypt in 8113 CE. Crosby responded to this by saying he would be glad to do that as long as his filming schedule at the time would allow it."Crypt of Civilization
[22] supported
The 1976 reunion drew 275 people with no restrictions on attendance, and the 2026 reunion was planned to be fully open to the public.
"As in 1976, when 275 people gathered with no restrictions on attendance, the 2026 reunion is fully open to the public."Time capsule, sculpture highlight pioneer reunion - Minot Daily News
[23] supported
The students who opened the old capsule also buried a new time capsule that is expected to be reopened in 2076.
"This generation of Susan B. Anthony students also buried a new time capsule, one expected to be reopened in 2076."Do you remember when? Digging up 1976 in Sioux Falls
[24] supported
A time capsule was buried in 1976 by the Kaukauna Bicentennial Committee and was scheduled to be unveiled fifty years later.
"The Friends of Grignon Mansion will unveil the contents of a time capsule buried in 1976 by the Kaukauna Bicentennial Committee, fifty years after it was sealed."1976 bicentennial time capsule found, to be opened July 26 at Kaukauna's Grignon Mansion - Kaukauna Community News
[25] supported
The Westinghouse time capsules were intended only for the people of 6939 CE and were not to be opened before then.
"Both these capsules are intended to be available to the people of 6939 CE only and are not to be opened before then."Crypt of Civilization
[26] supported
A new time capsule was planned to be buried during the 2026 reunion and opened in 2076.
"the burial of a newly written time capsule to be opened in 2076"Time capsule, sculpture highlight pioneer reunion - Minot Daily News
[27] supported
The planned unveiling was set for Sunday, July 26, 2026 at 1 p.m. at the Charles A. Grignon Mansion, coinciding with the mansion's public reopening for guided tours.
"The unveiling will take place on Sunday, July 26, 2026 at 1 p.m. at the Charles A. Grignon Mansion, and will coincide with the public reopening of the newly revamped mansion for guided tours."1976 bicentennial time capsule found, to be opened July 26 at Kaukauna's Grignon Mansion - Kaukauna Community News
[28] supported
The capsule had remained untouched for five decades and was expected to offer a window into life in Kaukauna in the mid-1970s.
"Buried as part of the nation’s bicentennial celebration, the capsule has remained untouched for five decades and is expected to offer a window into life in Kaukauna in the mid-1970s."1976 bicentennial time capsule found, to be opened July 26 at Kaukauna's Grignon Mansion - Kaukauna Community News
[29] supported
The unveiling was free to attend, with a small fee for guided mansion tours, and members of the public, media, and descendants of the original Bicentennial Committee were invited.
"Cost: Free to attend the unveiling; a small fee applies for guided mansion tours Members of the public, media, and descendants of the original Bicentennial Committee are invited to attend."1976 bicentennial time capsule found, to be opened July 26 at Kaukauna's Grignon Mansion - Kaukauna Community News
[30] supported
A plaque near the North Star Museum showed the capsule's dig-up date as 2026, which the city and historical society had not known about before a resident noticed it.
"which said that the time capsule buried there had a dig-up date of 2026!"Time Capsule Opening & Reveal Party Recap • North St. Paul, MN
[31] supported
When the capsule was opened after 50 years, it had been sitting in water, and a strong smell spread over the sidewalk.
"And then held it some more as the smell of 50 years of sitting water spread out over the sidewalk!"Time Capsule Opening & Reveal Party Recap • North St. Paul, MN
[32] supported
The items inside the capsule were not preserved as hoped, so Historical Society volunteers had to find copies of damaged documents and retrieve records from the Ramsey County records office to build a display.
"The items inside the time capsule were not preserved as we had hoped, and that made the volunteers at the Historical Society work hard to find copies of the damaged documents, pulling together artifacts from the time, and retrieving our history from the Ramsey County records office"Time Capsule Opening & Reveal Party Recap • North St. Paul, MN
[33] supported
At the community reveal event on June 25th, the time capsule items drew a line out the door for most of the evening, and organizers called the event a success despite the capsule's damaged condition.
"there was a line out the door for most of the evening to see the time capsule items!"Time Capsule Opening & Reveal Party Recap • North St. Paul, MN