Oops, it doesn't look like 'stadium have been rehearsing for this day' is a national day..

Other days

self appreciation

Self Appreciation Day
latina equal pay

Latina Equal Pay Day
my little pony

My Little Pony Day
stud

Stud Day
ride the wind

Ride The Wind Day
stress awareness

Stress Awareness Day
believe

Believe Day
me

Me Day
blanket fort

Blanket Fort Day
bow tie

Bow Tie Day