People wearing costumes wait in a room.
The people wait outside the building.
Waiting inside a room and waiting outside of a building cannot be done at the same time.
exists e2 e1 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 e1 x1 x2.(n_building(x2) & n_people(x1) & outside(e1,x2) & Actor(e1,x1) & v_wait(e1))