People in strange costumes in a play.
People perform in a play.
Saying someone is in a play is the same as saying someone will perform in a play.
exists s1 x1 x2 x3.(a_topic(x1) & in(x1,x2) & in(x2,x3) & n_play(x3) & n_costume(x2) & a_strange(s1) & Theme(s1,x2) & n_people(x1))
exists e1 x1 x2.(in(e1,x2) & n_play(x2) & Actor(e1,x1) & v_perform(e1) & n_people(x1))