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

Other days

unicorn

Unicorn Day
kiss a ginger

Kiss A Ginger Day
hiv awareness

Hiv Awareness Day
coffee

Coffee Day
self care

Self Care Day
stud

Stud Day
tulip

Tulip Day
ruby

Ruby Day
first love

First Love Day
martini

Martini Day