From https://web.mit.edu/adorai/timetraveler/

The Time Traveler Convention
May 7, 2005, 10:00pm EDT (08 May 2005 02:00:00 UTC)
East Campus Courtyard, MIT
42:21:36.025°N, 71:05:16.332°W
(42.360007,-071.087870 in decimal degrees)

What is it?

Technically, you would only need one time traveler convention. Time travelers from all eras could meet at a specific place at a specific time, and they could make as many repeat visits as they wanted. We are hosting the first and only Time Traveler Convention at MIT in one week, and WE NEED YOUR HELP!

Why do you need my help?

We need you to help PUBLICIZE the event so that future time travelers will know about the convention and attend. This web page is insufficient; in less than a year it will be taken down when I graduate, and futhermore, the World Wide Web is unlikely to remain in its present form permanently. We need volunteers to publish the details of the convention in enduring forms, so that the time travelers of future millennia will be aware of the convention. This convention can never be forgotten! We need publicity in MAJOR outlets, not just Internet news. Think New York Times, Washington Post, books, that sort of thing. If you have any strings, please pull them.

Great idea, I’d love to help! What should I do?

Write the details down on a piece of acid-free paper, and slip them into obscure books in academic libraries! Carve them into a clay tablet! If you write for a newspaper, insert a few details about the convention! Tell your friends, so that word of the convention will be preserved in our oral history! A note: Time travel is a hard problem, and it may not be invented until long after MIT has faded into oblivion. Thus, we ask that you include the latitude/longitude information when you publicize the convention.

You can also make an absolute commitment to publicize the convention afterwards. In that case, bring a time capsule or whatever it may be to the party, and then bury it afterwards.