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

Other days

stud

Stud Day
youth

Youth Day
get funky

Get Funky Day
law

Law Day
first love

First Love Day
aloxolt

Aloxolt Day
kale

Kale Day
lumpy rug

Lumpy Rug Day
hot chocolate

Hot Chocolate Day
ponytail

Ponytail Day