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

Other days

one

One Day
my little pony

My Little Pony Day
nae nae

Nae Nae Day
coffee

Coffee Day
reading

Reading Day
pick me

Pick Me Day
pumpkin

Pumpkin Day
martini

Martini Day
self care

Self Care Day
carpenters

Carpenters Day