Oops, it doesn't look like 'boycott the same day' is a national day..

Other days

lisp

Lisp Day
bounce

Bounce Day
healing

Healing Day
tulip

Tulip Day
boy friend

Boy Friend Day
boba

Boba Day
get funky

Get Funky Day
law

Law Day
slime

Slime Day
aloxolt

Aloxolt Day