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

Other days

buddy

Buddy Day
youth

Youth Day
blanket fort

Blanket Fort Day
cuddle up

Cuddle Up Day
artists

Artists Day
hoodie

Hoodie Day
my little pony

My Little Pony Day
coffee

Coffee Day
pick me

Pick Me Day
pampering

Pampering Day