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

Other days

girl friend

Girl Friend Day
azonto is acceptable

Azonto Is Acceptable Day
pick me

Pick Me Day
polyamory

Polyamory Day
singles

Singles Day
tulip

Tulip Day
ruby

Ruby Day
reading

Reading Day
blanket fort

Blanket Fort Day
slime

Slime Day