Oops, it doesn't look like 'park during hike on a hot day' is a national day..

Other days

hannah

Hannah Day
youth

Youth Day
cuddle up

Cuddle Up Day
polyamory

Polyamory Day
self care

Self Care Day
one

One Day
comfy

Comfy Day
ride the wind

Ride The Wind Day
offer

Offer Day
bow tie

Bow Tie Day