People in costumes wait to perform at an event.
People in costumes performing on the stage.
People are waiting to perform as opposed to performing at the moment.
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 x1 x2 x3 x4.(n_stage(x4) & a_topic(x1) & in(x1,x2) & on(e1,x4) & Actor(e1,x3) & v_perform(e1) & (x2 = x3) & n_costume(x2) & n_people(x1))