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

Other days

ride the wind

Ride The Wind Day
prosecco

Prosecco Day
gum

Gum Day
brow

Brow Day
self appreciation

Self Appreciation Day
boba

Boba Day
stress awareness

Stress Awareness Day
kiss a ginger

Kiss A Ginger Day
ruby

Ruby Day
slime

Slime Day