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

Other days

comfy

Comfy Day
artists

Artists Day
aloxolt

Aloxolt Day
tulip

Tulip Day
polyamory

Polyamory Day
lumpy rug

Lumpy Rug Day
self appreciation

Self Appreciation Day
my little pony

My Little Pony Day
get funky

Get Funky Day
carpenters

Carpenters Day