You can't knock this for geek genius.
Tell your friends, write it in the margin of library books, carve it into stone tablets and bury it in peat, but make sure that all future civilisations know about
The Time Traveler Convention - May 7, 2005:
"The Time Traveler Convention
May 7, 2005, 10:00pm EDT (08 May 2005 02:00:00 UTC)
East Campus Courtyard, MIT
(42.360007,-071.087870 in decimal degrees)"
The idea is that if time travel is in fact possible, it will be invented at some point in the future. So, if potential future time travellers know about the WORLD FAMOUS Time Traveler Convention, it'll be high on their list of places (and times) to visit. Ergo, pop along on the 7th and you might just see a myriad of people from assorted periods of the future there. :D
Of course, the alternative possibility is that it'll be the one place future time travellers are banned from going to, precisely because they'll be so expected, conspicuous and cause paradoxes/break the future/meet their own grandfathers etc.
Which would be ironic.
Expect humorous stories turning up at the end of the News where you live, and multiple socially deviant geeks posing as visitors from 2589. Of course, the canny real Time Traveller will be the guy looking nicely inconspicuous in the background...