When the artist actually goes on stage and starts performing. Set time depends on the bill: opener takes the stage at doors+30, headliner typically takes the stage 90–120 minutes after doors. Set time and set length (how long they play) drive the run-of-show, when changeovers happen, and when the venue can start load-out. Late set times push curfew risk. Headliner set times are public-facing (printed on tickets at festivals); club set times are sometimes withheld so fans show up early and buy drinks.