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

Other days

comfy

Comfy Day
lumpy rug

Lumpy Rug Day
youth

Youth Day
ask out your crush

Ask Out Your Crush Day
aloxolt

Aloxolt Day
coffee

Coffee Day
my little pony

My Little Pony Day
donate your hair

Donate Your Hair Day
law

Law Day
gallery

Gallery Day