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

Other days

prosecco

Prosecco Day
slime

Slime Day
cursing

Cursing Day
polyamory

Polyamory Day
hiv awareness

Hiv Awareness Day
bonang

Bonang Day
bow tie

Bow Tie Day
singles

Singles Day
azonto is acceptable

Azonto Is Acceptable Day
hoodie

Hoodie Day