three people dressed in costumes on a stage.
The people are not in normal clothing.
Costumes are usually not the normal clothing a person usually wears.
exists e1 x1 x2 x3 x4.(a_topic(x1) & in(e1,x3) & on(x3,x4) & n_stage(x4) & n_costume(x3) & Theme(e1,x2) & v_dress(e1) & (x1 = x2) & n_people(x1) & card_eq_3(x1))
exists x1.(n_people(x1) & -exists p1 s1 x2.(in(x1,x2) & n_clothing(x2) & a_normal(s1) & Theme(s1,x2)))