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

Other days

nae nae

Nae Nae Day
tulip

Tulip Day
lash

Lash Day
comfy

Comfy Day
ask out your crush

Ask Out Your Crush Day
self appreciation

Self Appreciation Day
cat girl

Cat Girl Day
cursing

Cursing Day
ruby

Ruby Day
ormille

Ormille Day