People in costumes wait to perform at an event.
Performers waiting for their turn to perform.
Waiting for their turn to perform is a rephrasing for wait to perform.
exists e1 p1 x1 x2.(Topic(e1,p1) & Actor(e1,x1) & v_wait(e1) & exists e2 x3.(at(e2,x3) & n_event(x3) & Actor(e2,x1) & v_perform(e2)) & in(x1,x2) & n_costume(x2) & n_people(x1))
exists e1 p1 x1 x2 x3.(a_topic(x1) & for(e1,x3) & Topic(x3,p1) & exists e2.(Actor(e2,x3) & v_perform(e2)) & n_turn(x3) & of(x3,x1) & n_thing(x1) & Actor(e1,x2) & v_wait(e1) & (x1 = x2) & n_performer(x1))