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

Other days

ruby

Ruby Day
cuddle up

Cuddle Up Day
fiancee

Fiancee Day
boy friend

Boy Friend Day
aloxolt

Aloxolt Day
slime

Slime Day
polyamory

Polyamory Day
coffee

Coffee Day
comfy

Comfy Day
brow

Brow Day