I was really inspired by weekly beats this past year that I wanted apply the same kind of streak idea to drawing in 2015. Being a web developer I decided to build a website to let anyone host events like this. It's conceptually very similar to weekly beats, there are deadlines, and start and stop dates. Each week (or day) you have to submit something and you get a little box on the site filled in. You can comment on other people's submissions as well.
You can find it here: http://streak.club
Here's the drawing streak I've been doing in January with a few people I invited: http://streak.club/s/1/daily-art-warmup, and here's a 365 day one: http://streak.club/s/8/daily-art-2015 that starts in a few days.
I would love for any feedback, or to have some of the people here try using it. It looks like someone already created a weekly music streak here: http://streak.club/s/16/weekly-music
I currently don't have an on-site music player, so you'd have to download or link soundcloud, but I'll probably have something pretty soon.
Thanks!!