Oops, it doesn't look like 'bird whipped cream day' is a national day..

Other days

donate your hair

Donate Your Hair Day
slime

Slime Day
stud

Stud Day
hiv awareness

Hiv Awareness Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
blanket fort

Blanket Fort Day
my little pony

My Little Pony Day
appreciate yaself a lil extra

Appreciate Yaself A Lil Extra Day
azonto is acceptable

Azonto Is Acceptable Day
ruby

Ruby Day