Oops, it doesn't look like 'side boo day' is a national day..

Other days

promposal

Promposal Day
self care

Self Care Day
slime

Slime Day
aloxolt

Aloxolt Day
stud

Stud Day
camera

Camera Day
prescription drug take back

Prescription Drug Take Back Day
brow

Brow Day
cuddle up

Cuddle Up Day
lash

Lash Day