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

Other days

gum

Gum Day
cuddle up

Cuddle Up Day
ruby

Ruby Day
reading

Reading Day
special education

Special Education Day
comfy

Comfy Day
self care

Self Care Day
frozen yogurt

Frozen Yogurt Day
ponytail

Ponytail Day
youth

Youth Day