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

Other days

ruby

Ruby Day
youth

Youth Day
pick me

Pick Me Day
bounce

Bounce Day
stress awareness

Stress Awareness Day
embarrass your best friend

Embarrass Your Best Friend Day
reading

Reading Day
slime

Slime Day
lash

Lash Day
cuddle up

Cuddle Up Day