A group of people spending time at a park in costume.
People dressed in costumes in a park.
If you in costume you can say you are dressed in costumes
exists e1 x1 x2 x3 x4 x5 x6.(a_topic(x1) & of(x1,x2) & in(e1,x6) & n_costume(x6) & at(e1,x5) & n_park(x5) & Theme(e1,x4) & Actor(e1,x3) & v_spend(e1) & n_time(x4) & (x2 = x3) & n_people(x2) & n_group(x1))
exists e1 x1 x2 x3 x4.(a_topic(x1) & in(e1,x4) & n_park(x4) & in(e1,x3) & n_costume(x3) & Theme(e1,x2) & v_dress(e1) & (x1 = x2) & n_people(x1))