Oops, it doesn't look like 'pick up your guitar day' is a national day..

Other days

boba

Boba Day
my little pony

My Little Pony Day
unicorn

Unicorn Day
healing

Healing Day
bonang

Bonang Day
blanket fort

Blanket Fort Day
buddy

Buddy Day
martini

Martini Day
aloxolt

Aloxolt Day
bow tie

Bow Tie Day