Oops, it doesn't look like 'boyfriend sus day' is a national day..

Other days

donate your hair

Donate Your Hair Day
bounce

Bounce Day
latina equal pay

Latina Equal Pay Day
eat what you want

Eat What You Want Day
kale

Kale Day
brow

Brow Day
comfy

Comfy Day
pick me

Pick Me Day
gum

Gum Day
china

China Day