People of Chinese and Vietnamese descent (I hope I'm not leaving out other cultures) celebrate the Mid Autumn Festival or the Moon Festival today. We eat moon cake and fruites to celebrate the full moon. In the old country, kids walk around at night with lit lanterns and are often given goodies to eat (kind of like trick or treating, I guess, but the kids don't ASK for the treats)
Here's a link for more info:
http://en.wikipedia.org/wiki/Moon_Festival