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

Other days

tulip

Tulip Day
bow tie

Bow Tie Day
azonto is acceptable

Azonto Is Acceptable Day
reading

Reading Day
lisp

Lisp Day
chocolate milkshake

Chocolate Milkshake Day
bubble bath

Bubble Bath Day
slime

Slime Day
brow

Brow Day
bonang

Bonang Day