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

Other days

brow

Brow Day
boba

Boba Day
offer

Offer Day
aloxolt

Aloxolt Day
frozen yogurt

Frozen Yogurt Day
blanket fort

Blanket Fort Day
one

One Day
stud

Stud Day
bubble bath

Bubble Bath Day
ask out your crush

Ask Out Your Crush Day