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

Other days

healing

Healing Day
cursing

Cursing Day
polyamory

Polyamory Day
unicorn

Unicorn Day
ruby

Ruby Day
ask out your crush

Ask Out Your Crush Day
first love

First Love Day
kale

Kale Day
carpenters

Carpenters Day
boba

Boba Day