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

Other days

ruby

Ruby Day
cursing

Cursing Day
donate your hair

Donate Your Hair Day
tulip

Tulip Day
bubble bath

Bubble Bath Day
boy friend

Boy Friend Day
boba

Boba Day
youth

Youth Day
slime

Slime Day
kiss a brunette

Kiss A Brunette Day