Oops, it doesn't look like 'go brownies day' is a national day..

Other days

cursing

Cursing Day
ruby

Ruby Day
stress awareness

Stress Awareness Day
healing

Healing Day
boba

Boba Day
bow tie

Bow Tie Day
promposal

Promposal Day
unicorn

Unicorn Day
special education

Special Education Day
tulip

Tulip Day