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

Other days

martini

Martini Day
artists

Artists Day
china

China Day
azonto is acceptable

Azonto Is Acceptable Day
prosecco

Prosecco Day
self care

Self Care Day
chocolate milkshake

Chocolate Milkshake 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
self appreciation

Self Appreciation Day