There are a lot of 48-Hour film competitions out there. They are usually a contest in which teams of filmmakers are assigned a genre, a character, a prop, and a line of dialogue, and have 48 hours to create a short film containing those elements. Shortly after the 48 hours of filmmaking, the films are then screened at a theater in the city. The most famous one is the 48 Hour Film Projecta wild and sleepless competition, created by Mark Ruppert and is produced by Ruppert and Liz Langston.

In 2012, over 50,000 filmmakers made almost 4,000 films in 120 cities on 6 continents around the world. Over the 11 years of 48 Hour Film Project over 19,000 films have been made by 278,000 people. You can see press about them here.