Oops, it doesn't look like 'coeliac awareness day' is a national day..

Other days

Emoji Day

eat what you want

Eat What You Want Day

bow tie

Bow Tie Day

polyamory

Polyamory Day

bounce

Bounce Day

self appreciation

Self Appreciation Day

stress awareness

Stress Awareness Day

cursing

Cursing Day

brow

Brow Day

kiss a ginger

Kiss A Ginger Day