Oops, it doesn't look like 'team in day' is a national day..

Other days

blanket fort

Blanket Fort Day
brow

Brow Day
self care

Self Care Day
nail polish

Nail Polish Day
martini

Martini Day
ruby

Ruby Day
bow tie

Bow Tie Day
kiss a brunette

Kiss A Brunette Day
bounce

Bounce Day
law

Law Day