Don’t know what Avatar Day is? Don’t care? You should!

For anyone who hasn’t caught a glimpse of entertainment news the past few weeks, today is your “unprecedented!” chance to see a 16-minute sneak peek of James Cameron‘s new movie, Avatar, in IMAX 3D.

Or, more accurately, was your chance. Tickets to this ridiculous publicity stunt went so fast they crashed the film’s Web site, though you may still be able to pick up a pair to the Virginia showings on craigslist. The whole thing makes Cameron’s “I’m king of the world!” Oscar speech sound like “Aww, shucks.”

In the meantime, here’s the plain ol’ regular-length trailer of the sci-fi flick, out Dec. 18. And below that is today’s other “event” trailer release, for Michael Moore‘s Capitalism: A Love Story. (A preview for the 2010 remake of The Wolf Man, with Benicio Del Toro, also surfaced briefly this week, but right now there’s no trace of it on the ‘net.)

Anyway, don’t wet your pants.