From today until the 28th there will be a steam of speedruns of various games done in order to get donations for Doctors Without Borders.
Here is a link to the stream on Twitch.
Here is a link to the schedule which adjusts to your time zone.
Here is a link to a page with links to the prize list, a list of incentives to either do more with certain games or choose what to do with customizable parts of games, and a link to the donation page.
If you donate $20 during the first 4 days you will be entered for a chance to win a PS4. Even if you can't donate it's still fun to watch the runs.