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

Other days

fiancee

Fiancee Day
blanket fort

Blanket Fort Day
law

Law Day
self care

Self Care Day
martini

Martini Day
raise awerness of zeus

Raise Awerness Of Zeus Day
self appreciation

Self Appreciation Day
cursing

Cursing Day
ruby

Ruby Day
special education

Special Education Day