concert picnic
(verb) A practice where people sit outside of an outdoor concert so they can listen gratis to the performance. This may be done because they do not want to pay, the show is sold out, or it involves less engagement from them.
A: Did you guys go to the Jay-Z concert?
B: Yeah, but we just concert picnicked because we are cheap.
B: Yeah, but we just concert picnicked because we are cheap.