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

Other days

youth

Youth Day
boba

Boba Day
ruby

Ruby Day
latina equal pay

Latina Equal Pay Day
ormille

Ormille Day
eat what you want

Eat What You Want Day
pampering

Pampering Day
believe

Believe Day
hoodie

Hoodie Day
cursing

Cursing Day