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

Other days

promposal

Promposal Day
brow

Brow Day
ruby

Ruby Day
gum

Gum Day
ponytail

Ponytail Day
cuddle up

Cuddle Up Day
ride the wind

Ride The Wind Day
self appreciation

Self Appreciation Day
ask out your crush

Ask Out Your Crush Day
believe

Believe Day