A rock band is playing for a crowd.
People are at a music festival.
Rock bands play more places than just a music festival.
exists e1 x1 x2 x3.(for(e1,x3) & n_crowd(x3) & Actor(e1,x1) & v_play(e1) & n_band(x1) & of(x1,x2) & n_rock(x2))
exists p1 x1.(exists x2 x3.(at(x1,x2) & n_festival(x2) & of(x2,x3) & n_music(x3)) & n_people(x1))