National Coming out day was started in 1988 to mark the anniversary of the 1987 March on Washington for Gay and Lesbian Rights and is now celebrated around the world. Every year on this day closeted LGBT people are encouraged to come out to at least one person.
Coming out is not something you do just once, it's an ongoing process that lasts a lifetime. Every time you change jobs, move to a new neighborhood or any situation where you'll meet new people, you're faced with the question of whether or not to let someone know who you really are. It's always hardest the first time, but it gets easier with practice.
The closet is a dark and lonely place to live. You only get one shot at life, so why not live it openly and honestly?