Stephen Hawking hosted a party for time travelers, but no one came

In 2009, Stephen Hawking ran an experiment that required champagne, balloons, and hors d'oeuvres, to demonstrate that backward time travel probably isn't possible.
It was a time travelers' party — but no one showed. And that was the point.
"I have experimental evidence that time travel is not possible," Hawking told reporters at the Seattle Science Festival in 2012. "I gave a party for time-travelers, but I didn't send out the invitations until after the party. I sat there a long time, but