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

Other days

coffee

Coffee Day
chocolate milkshake

Chocolate Milkshake Day
prosecco

Prosecco Day
bonang

Bonang Day
self appreciation

Self Appreciation Day
martini

Martini Day
ask out your crush

Ask Out Your Crush Day
kiss a ginger

Kiss A Ginger Day
blanket fort

Blanket Fort Day
latina equal pay

Latina Equal Pay Day