SOS 4.8 Festival On Stage. 2016.

The SOS 4.8 Festival lasts 48 hours (from Friday afternoon to early Sunday), plus called "snacks SOS" (Saturday and Sunday from 12:00 to 17:00) which are free.
In 48 hours, more than 50 performances between bands and DJs.
Image from "snacks SOS" (aperitivos del SOS).