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

Other days

bounce

Bounce Day
self care

Self Care Day
book

Book Day
me

Me Day
my little pony

My Little Pony Day
fiancee

Fiancee Day
boba

Boba Day
ask out your crush

Ask Out Your Crush Day
cuddle up

Cuddle Up Day
reading

Reading Day