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

Other days

ruby

Ruby Day
tulip

Tulip Day
aloxolt

Aloxolt Day
coffee

Coffee Day
chocolate milkshake

Chocolate Milkshake Day
china

China Day
youth

Youth Day
kiss a ginger

Kiss A Ginger Day
stud

Stud Day
artists

Artists Day