Oops, it doesn't look like 'took a knee on mlb opening day' is a national day..

Other days

Prosecco Day

Lost Sock Memorial Day

Eat What You Want Day

My Little Pony Day

Tell Ur Crush You Like Them Day

Bounce Day

Pampering Day

Ormille Day

Appreciate Yaself A Lil Extra Day

Chocolate Milkshake Day