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

Other days

promposal

Promposal Day
boba

Boba Day
singles

Singles Day
cat girl

Cat Girl Day
self care

Self Care Day
mean girls

Mean Girls Day
ruby

Ruby Day
tell a fairytale

Tell A Fairytale Day
stud

Stud Day
my little pony

My Little Pony Day