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

Other days

nae nae

Nae Nae Day
tell a fairytale

Tell A Fairytale Day
ask out your crush

Ask Out Your Crush Day
comfy

Comfy Day
ruby

Ruby Day
book

Book Day
cuddle up

Cuddle Up Day
aloxolt

Aloxolt Day
fiancee

Fiancee Day
promposal

Promposal Day