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

Other days

gum

Gum Day
carpenters

Carpenters Day
bow tie

Bow Tie Day
boba

Boba Day
aloxolt

Aloxolt Day
bonang

Bonang Day
self care

Self Care Day
my little pony

My Little Pony Day
ponytail

Ponytail Day
comfy

Comfy Day