Oops, it doesn't look like 'convention began its first day' is a national day..

Other days

promposal

Promposal Day
pick me

Pick Me Day
stud

Stud Day
ruby

Ruby Day
bounce

Bounce Day
me

Me Day
lash

Lash Day
prosecco

Prosecco Day
tulip

Tulip Day
boba

Boba Day