Oops, it doesn't look like 'gay uncles day' is a national day..

Other days

fiancee

Fiancee Day
ask out your crush

Ask Out Your Crush Day
kiss a ginger

Kiss A Ginger Day
youth

Youth Day
kiss a brunette

Kiss A Brunette Day
girl friend

Girl Friend Day
me

Me Day
eat what you want

Eat What You Want Day
ruby

Ruby Day
bow tie

Bow Tie Day