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

Other days

boba

Boba Day
gum

Gum Day
fiancee

Fiancee Day
bonang

Bonang Day
unicorn

Unicorn Day
cuddle up

Cuddle Up Day
ruby

Ruby Day
reading

Reading Day
tulip

Tulip Day
tell a fairytale

Tell A Fairytale Day