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

Other days

lash

Lash Day
brow

Brow Day
tulip

Tulip Day
prosecco

Prosecco Day
bonang

Bonang Day
self appreciation

Self Appreciation Day
ask out your crush

Ask Out Your Crush Day
ruby

Ruby Day
boy friend

Boy Friend Day
pick me

Pick Me Day