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

Other days

artists

Artists Day
carpenters

Carpenters Day
cuddle up

Cuddle Up Day
nae nae

Nae Nae Day
azonto is acceptable

Azonto Is Acceptable Day
boy friend

Boy Friend Day
self appreciation

Self Appreciation Day
offer

Offer Day
healing

Healing Day
coffee

Coffee Day