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

Other days

aloxolt

Aloxolt Day
youth

Youth Day
eat what you want

Eat What You Want Day
slime

Slime Day
gum

Gum Day
ride the wind

Ride The Wind Day
donate your hair

Donate Your Hair Day
cuddle up

Cuddle Up Day
ruby

Ruby Day
hannah

Hannah Day