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

Other days

promposal

Promposal Day
gum

Gum Day
lash

Lash Day
frozen yogurt

Frozen Yogurt Day
stud

Stud Day
special education

Special Education Day
aloxolt

Aloxolt Day
bow tie

Bow Tie Day
offer

Offer Day
kiss a ginger

Kiss A Ginger Day