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

Other days

kiss a ginger

Kiss A Ginger Day
bonang

Bonang Day
ruby

Ruby Day
bow tie

Bow Tie Day
lash

Lash Day
first love

First Love Day
lumpy rug

Lumpy Rug Day
reading

Reading Day
cuddle up

Cuddle Up Day
pumpkin

Pumpkin Day