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

Other days

believe

Believe Day
cat girl

Cat Girl Day
cuddle up

Cuddle Up 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
aloxolt

Aloxolt Day
ormille

Ormille Day
hiv awareness

Hiv Awareness Day
china

China Day