Oops, it doesn't look like 'Read On The Bus day' is a national day..

Other days

gum

Gum Day
lumpy rug

Lumpy Rug Day
polyamory

Polyamory Day
offer

Offer Day
pick me

Pick Me Day
stud

Stud Day
boba

Boba Day
kiss a brunette

Kiss A Brunette Day
brow

Brow Day
slime

Slime Day