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

Other days

slime

Slime Day
latina equal pay

Latina Equal Pay Day
offer

Offer Day
cursing

Cursing Day
one

One Day
kiss a brunette

Kiss A Brunette Day
ruby

Ruby Day
lumpy rug

Lumpy Rug Day
bounce

Bounce Day
boy friend

Boy Friend Day