What did Stephen Hawking do to check for time travelers, and did anyone come?

"On 28 June 2009, British astrophysicist Stephen Hawking held a reception for time travellers at the University of Cambridge . The physicist arranged for balloons, champagne , and nibbles for his guests, but did not send out the invitations until the following day, after the party was over."

"On June 28, 2009, Hawking threw a party for time travelers"

"but did not send out the invitations until the following day, after the party was over."

"The next day, he sent out the invitations."

"In preparing for the event, Hawking said he hoped that copies of the invitation might survive for thousands of years, and that "one day someone living in the future will find the information and use a wormhole time machine to come back to my party, proving that time travel will one day be possible"."

"Maybe one day, someone living in the future will find the information and use a wormhole time machine to come back to my party"

"Hawking waited in the room for a few hours before leaving, and no visitors arrived."

"Nobody attended Hawking's party."

"He regarded the event as "experimental evidence that time travel is not possible"."

"On 28 June 2009, Stephen Hawking held a party for time-travellers [ 1 , 2 , 3 ] . Champagne, balloons, nibbles: this party had all the trappings of an era-defining party, hoping to entice time-travellers into making an appearance."

""I have experimental evidence that time travel is not possible," Hawking said of the event."

"So it was a little unusual that when he threw a party in 2009, not a single guest attended."

"In 2009, the physicist Stephen Hawking had thrown a party, and no one showed up."

"However, nobody was invited to the event – in advance – and it was only publicly announced afterwards, with exact time and location details, in the hope that an invite would survive the centuries/millennia required to fall into the hands of a party-loving time-traveller."

"As it happened, Hawking’s party was actually an experiment on the possibility of time travel. (Invitations were sent only after the party was over.)"

"He rented a space at Cambridge University and got balloons, decorations, and, of course, the champagne. Then he sat in the empty room for a few hours and left."

"There were balloons. There was champagne. There was a giant banner, which read “Welcome, Time Travellers.”"

"Despite all the effort put into throwing and publicizing this party, “no one came” [ 4 ] . Leaving Hawking to party alone."

"By publishing the party invitation in his mini-series Into the Universe With Stephen Hawking , Hawking hoped to lure futuristic time travelers."

"Only then did he send out the invitation."

"A time traveler, in theory, at least, could attend a party even if the invitation was issued many years hence. If any time travelers did see Hawking’s invitation, though, none of them took up the offer."

"Unfortunately, no one showed up."

"That's precisely what famed astrophysicist Stephen Hawking did on June 28, 2009."

"“I’m hoping copies of [the invitation], in one form or another, will survive for many thousands of years,” Hawking said."

"In which case, the party is on June 28, 2009, and the coordinates are 52° 12’ 21” N, 0° 7’ 4.7” E."

"Since nobody showed up to Stephen Hawking's time travel party, we have a few possible conclusions:"

"In 2013, a press in London printed a limited run of invitations for a party that had already happened."