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

Other days

lisp

Lisp Day
cursing

Cursing Day
azonto is acceptable

Azonto Is Acceptable Day
believe

Believe Day
slime

Slime Day
ask out your crush

Ask Out Your Crush Day
ruby

Ruby Day
prosecco

Prosecco Day
bounce

Bounce Day
ormille

Ormille Day