Oops, it doesn't look like 'amateur radio field day' is a national day..

Other days

cursing

Cursing Day
latina equal pay

Latina Equal Pay Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
chocolate milkshake

Chocolate Milkshake Day
promposal

Promposal Day
one

One Day
my little pony

My Little Pony Day
tell ur crush you like them

Tell Ur Crush You Like Them Day
hiv awareness

Hiv Awareness Day
raise awerness of zeus

Raise Awerness Of Zeus Day