Every year, a friend of mine picks a bar somewhere in the world and a date and time. Whoever shows up, shows up. It makes for a great excuse to travel. I've only managed to make it to two of them so far: one at a small bar on an island off the coast of Thailand, and another at a place in Kalambaka, Greece.
Others have been in Spain, Costa Rica, Vietnam, and Ireland. The next one is in Prague this October, although I sadly won't be able to make it.