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

Other days

artists

Artists Day
girl friend

Girl Friend Day
first love

First Love Day
self care

Self Care Day
brow

Brow Day
ask out your crush

Ask Out Your Crush Day
kale

Kale Day
my little pony

My Little Pony Day
boba

Boba Day
boyfriend

Boyfriend Day