Oops, it doesn't look like 'championships in different sports on the same day' is a national day..

Other days

ride the wind

Ride The Wind Day
reading

Reading Day
self care

Self Care Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
slime

Slime Day
unicorn

Unicorn Day
donate your hair

Donate Your Hair Day
bonang

Bonang Day
self appreciation

Self Appreciation Day
first love

First Love Day