Oops, it doesn't look like 'colour tops day' is a national day..

Other days

ride the wind

Ride The Wind Day
boy friend

Boy Friend Day
bounce

Bounce Day
cursing

Cursing Day
believe

Believe Day
slime

Slime Day
get funky

Get Funky Day
pick me

Pick Me Day
brow

Brow Day
boba

Boba Day