Oops, it doesn't look like 'yaoi seth day' is a national day..

Other days

boba

Boba Day
artists

Artists Day
hoodie

Hoodie Day
ask out your crush

Ask Out Your Crush Day
ponytail

Ponytail Day
pumpkin

Pumpkin Day
pick me

Pick Me Day
self care

Self Care Day
martini

Martini Day
cuddle up

Cuddle Up Day