From the HRC "National Coming Out Day" page :

This year will also mark an important hallmark as National Coming Out Day, falls on the 20th anniversary of the 1987 Gay and Lesbian March on Washington, and the unfurling of the AIDS Quilt on the National Mall. The very first National Coming Out Day was celebrated a year to the day later as a way of continuing the spirit of openness, honesty and visibility that the March and the AIDS Quilt presentation inspired. 

If you know of events in your area, please add them to the calendar!