Oops, it doesn't look like 'make up your own scene members day' is a national day..

Other days

gum

Gum Day
polyamory

Polyamory Day
kiss a brunette

Kiss A Brunette Day
my little pony

My Little Pony Day
artists

Artists Day
slime

Slime Day
self appreciation

Self Appreciation Day
blanket fort

Blanket Fort Day
kiss a ginger

Kiss A Ginger Day
cursing

Cursing Day