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

Other days

fiancee

Fiancee Day
kale

Kale Day
bow tie

Bow Tie Day
carpenters

Carpenters Day
buddy

Buddy Day
law

Law Day
first love

First Love Day
cuddle up

Cuddle Up Day
youth

Youth Day
hannah

Hannah Day