Oops, it doesn't look like 'buoyancy laboratory in houston for a day' is a national day..

Other days

prosecco

Prosecco Day
ask out your crush

Ask Out Your Crush Day
bow tie

Bow Tie Day
carpenters

Carpenters Day
stress awareness

Stress Awareness Day
cuddle up

Cuddle Up Day
self appreciation

Self Appreciation Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
healing

Healing Day
lumpy rug

Lumpy Rug Day