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

Other days

boba

Boba Day
cuddle up

Cuddle Up Day
nae nae

Nae Nae Day
lost sock memorial

Lost Sock Memorial Day
donate your hair

Donate Your Hair Day
comfy

Comfy Day
slime

Slime Day
pumpkin

Pumpkin Day
reading

Reading Day
gum

Gum Day