At a party or gathering, a door prize may be awarded to one or more persons attending, via a raffle

Raffle

A raffle is a competition in which people obtain numbered tickets, each ticket having the chance of winning a prize. At a set time, the winners are drawn from a container holding a copy of every number...

 or drawing. Prizes can be small things such as pens, bookmarks, and buttons or they can be larger, more expensive items like gift baskets, cash, tickets to concerts, bicycles, or furniture items.

The term can also refer to a cyclist colliding with the open door of a parked car; see door zone

Door zone

The door zone is the space spanning about four feet from the sides of parallel parked cars. It is hazardous to ride a bicycle or motorcycle in a door zone because if a door is suddenly opened, the cyclist must either crash into it , brake suddenly, or swerve into the adjacent lane of traffic...

.