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

Other days

camera

Camera Day
special education

Special Education Day
aloxolt

Aloxolt Day
boba

Boba Day
fiancee

Fiancee Day
hiv awareness

Hiv Awareness Day
bow tie

Bow Tie Day
cursing

Cursing Day
stress awareness

Stress Awareness Day
comfy

Comfy Day