Just found out about this a few hours back, surprised to not see a thread here.

Games Done Quick is running a charity marathon to help with Hurricane Harvey relief.

Looks to be a quick 3 day thing (quick compared to their normal week long runs).

https://gamesdonequick.com/

Details and twitch stream embedded at the website.
Just started at 8 PM us Eastern time, and they're just finishing up the first run (Megaman X 100%) as I type this.