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

Other days

polyamory

Polyamory Day
blanket fort

Blanket Fort Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
embarrass your best friend

Embarrass Your Best Friend Day
get funky

Get Funky Day
emoji

Emoji Day
youth

Youth Day
bow tie

Bow Tie Day
my little pony

My Little Pony Day
stress awareness

Stress Awareness Day