Yup, it’s another one of those.
The European Speedster Assembly 2015 is a video game speedrun marathon, and just like SGDQ they support Doctors Without Borders with any donations earned.
The event will start tomorrow on Sunday, June 28th at 8 AM EDT (2 PM CEST), and will run for two weeks.
Just like last year, there will be two simultaneous streams (Purple and Yellow stream respectively). Each stream has its own schedule. Purple will start tomorrow, with Yellow following a day later.
Of special note is that they’re running A Hat in Time on Tuesday, June 30th, at 8:20 AM EDT. This might be just the beta version of the game, but it marks the game’s first appearance on a marathon nonetheless (at least to my knowledge).