Oops, it doesn't look like 'spam phone call day' is a national day..

Other days

boy friend

Boy Friend Day
ormille

Ormille Day
pick me

Pick Me Day
youth

Youth Day
my little pony

My Little Pony Day
blanket fort

Blanket Fort Day
artists

Artists Day
brow

Brow Day
slime

Slime Day
nae nae

Nae Nae Day