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

Other days

reading

Reading Day
my little pony

My Little Pony Day
ruby

Ruby Day
ride the wind

Ride The Wind Day
slime

Slime Day
prosecco

Prosecco Day
gum

Gum Day
boba

Boba Day
stud

Stud Day
cat girl

Cat Girl Day