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

Other days

ruby

Ruby Day
slime

Slime Day
nae nae

Nae Nae Day
offer

Offer Day
boy friend

Boy Friend Day
emoji

Emoji Day
ponytail

Ponytail Day
aloxolt

Aloxolt Day
cuddle up

Cuddle Up Day
youth

Youth Day