I recently came across a 4-day music "festival" happening in Medellin. If you missed Altavoz, this is your chance to see local, national, and a few international artists play in Medellin. The festival is called Circulart. And from what I understand it's interdisciplinary (music, tenchology, and marketing). So there'll also be lectures and workshops if live music isn't your thing. Below is a link to the site as well as the programación!
I'm sure I'll be going everyday for at least part of it, if anyone is interested in joining!