Happy Fat Tuesday!
Mardi gras is French for Fat Tuesday, which is the last night of partying before Lent begins (which is a time of fasting and religious practice) on Ash Wednesday.
New Orleans is the most famous city for Mardi gras because they go all-out with the celebrations.
If you're interested in celebrating in Portland, Oregon you can find a list of events here.
And if you're interested in making your own Mardi Gras mask, check this site out.