Oops, it doesn't look like 'arena league held media day' is a national day..

Other days

boyfriend

Boyfriend Day
artists

Artists Day
martini

Martini Day
my little pony

My Little Pony Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
emoji

Emoji Day
bow tie

Bow Tie Day
raise awerness of zeus

Raise Awerness Of Zeus Day
ask out your crush

Ask Out Your Crush Day
gum

Gum Day