Oops, it doesn't look like 'continue to be difficult riddle to solve for day' is a national day..

Other days

stress awareness

Stress Awareness Day
offer

Offer Day
cuddle up

Cuddle Up Day
youth

Youth Day
bow tie

Bow Tie Day
tulip

Tulip Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
kale

Kale Day
raise awerness of zeus

Raise Awerness Of Zeus Day
blanket fort

Blanket Fort Day