A group of young people get into costume in a sparse room.
People putting on clothes.
The people that get into costume are implied to be the people that are putting on clothes.
exists e1 s1 s2 x1 x2 x3 x4.(in(e1,x4) & n_room(x4) & a_sparse(s2) & Theme(s2,x4) & into(e1,x3) & n_costume(x3) & Actor(e1,x1) & v_get(e1) & of(x1,x2) & n_people(x2) & a_young(s1) & Theme(s1,x2) & n_group(x1))
exists e1 x1 x2 x3.(a_topic(x1) & on(e1,x3) & n_clothes(x3) & Actor(e1,x2) & v_put(e1) & (x1 = x2) & n_people(x1))