Oops, it doesn't look like 'everyone goes to the gym day' is a national day..

Other days

african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
stress awareness

Stress Awareness Day
lost sock memorial

Lost Sock Memorial Day
azonto is acceptable

Azonto Is Acceptable Day
comfy

Comfy Day
youth

Youth Day
my little pony

My Little Pony Day
emoji

Emoji Day
prosecco

Prosecco Day
latina equal pay

Latina Equal Pay Day