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

Other days

first love

First Love Day
raise awerness of zeus

Raise Awerness Of Zeus Day
youth

Youth Day
promposal

Promposal Day
cuddle up

Cuddle Up Day
comfy

Comfy Day
slime

Slime Day
bow tie

Bow Tie Day
offer

Offer Day
tell a fairytale

Tell A Fairytale Day