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

Other days

bubble bath

Bubble Bath Day
boba

Boba Day
ride the wind

Ride The Wind Day
stress awareness

Stress Awareness Day
reading

Reading Day
gum

Gum Day
artists

Artists Day
pampering

Pampering Day
bow tie

Bow Tie Day
fiancee

Fiancee Day