I was lucky enough to go to a local indie movie theater and watch the series finale on the big screen
(Video input, of course, not via film projector.) The theater staff wrapped their concession stand snacks in DHARMA labels (really, just san serif, all caps fonts on white paper, haha), gave out leis, a compass, and a white or black stone, and served island punch. They even put the DHARMA INITIATIVE logo everywhere:
http://www.flickr.com/photos/designfemme/4704497965/
http://www.flickr.com/photos/designfemme/4704486601/
It was funny because the host would do some contest giveaways during the commercial breaks, but because his back was to the screen, he didn't know when the commercials ended. So whenever the show came back on, the audience would scream at him to get off stage, turn up the sound, and kill the lights.
Good times. I'm already re-watching Season 1 again