From The Infosphere, the Futurama Wiki
|Celebrated by||The Wongs|
|First appearance||"Where the Buggalo Roam" (3ACV10)|
Mars Day celebrates the sale of Mars from the Native Martians to Sir Reginald Wong for a bead. As a part of the celebration, people are allowed to throw garbage wherever they want because, according to Leo Wong, Mars is a "big empty planet."