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

Other days

martini

Martini Day
tulip

Tulip Day
camera

Camera Day
tell a fairytale

Tell A Fairytale Day
tell ur crush you like them

Tell Ur Crush You Like Them Day
ruby

Ruby Day
youth

Youth Day
china

China Day
reading

Reading Day
pampering

Pampering Day