People wearing costumes wait in a room.
The group is indoors.
The people are in a group.
exists e1 e2 x1 x2 x3 x4.(in(e2,x4) & n_room(x4) & Actor(e2,x1) & v_wait(e2) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_costume(x3) & (x1 = x2) & n_people(x1))
exists p1 x1.(n_group(x1) & exists x2.((x1 = x2) & n_indoor(x2)))