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

Other days

boyfriend

Boyfriend Day
hiv awareness

Hiv Awareness Day
martini

Martini Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
my little pony

My Little Pony Day
youth

Youth Day
slime

Slime Day
eat what you want

Eat What You Want Day
raise awerness of zeus

Raise Awerness Of Zeus Day
me

Me Day