Oops, it doesn't look like 'do not cheat on your girl day' is a national day..

Other days

promposal

Promposal Day
cuddle up

Cuddle Up Day
pumpkin

Pumpkin Day
boy friend

Boy Friend Day
carpenters

Carpenters Day
stress awareness

Stress Awareness Day
first love

First Love Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
self appreciation

Self Appreciation Day
my little pony

My Little Pony Day