It's time for Awesome Games Done Quick 2015, the latest iteration in a series of speedrunning marathons that have been raising money for charitable causes since 2010. Last year's AGDQ raised over a million dollars for the The Prevent Cancer Foundation, making it the most successful charitable game event yet.
For more information on the event, including a complete schedule of games and runners for the upcoming marathon: https://gamesdonequick.com/
For clips from previous marathons:
https://www.youtube.com/user/SpeedDemosArchiveSDA
https://www.youtube.com/user/gamesdonequick
Here's a trailer:
https://www.youtube.com/watch?v=nszHD1LZMWM