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

Other days

promposal

Promposal Day
gum

Gum Day
bow tie

Bow Tie Day
stud

Stud Day
kiss a brunette

Kiss A Brunette Day
carpenters

Carpenters Day
buddy

Buddy Day
boba

Boba Day
kale

Kale Day
my little pony

My Little Pony Day