Oops, it doesn't look like 'historical centres historical centres day' is a national day..

Other days

comfy

Comfy Day

self appreciation

Self Appreciation Day

frozen yogurt

Frozen Yogurt Day

artists

Artists Day

carpenters

Carpenters Day

buddy

Buddy Day

cursing

Cursing Day

Me Day

tell ur crush you like them

Tell Ur Crush You Like Them Day

ride the wind

Ride The Wind Day