Oops, it doesn't look like 'stomach pain day' is a national day..

Other days

special education

Special Education Day

azonto is acceptable

Azonto Is Acceptable Day

offer

Offer Day

Me Day

bounce

Bounce Day

pick me

Pick Me Day

self appreciation

Self Appreciation Day

ponytail

Ponytail Day

appreciate yaself a lil extra

Appreciate Yaself A Lil Extra Day

donate your hair

Donate Your Hair Day