People eating at an outdoor event.
They are indoors.
People cannot be at an outdoor event and indoors at the same time.
exists e1 s1 x1 x2 x3.(a_topic(x1) & at(e1,x3) & n_event(x3) & a_outdoor(s1) & Theme(s1,x3) & Actor(e1,x2) & v_eat(e1) & (x1 = x2) & n_people(x1))
exists p1 x1.(n_thing(x1) & exists x2.((x1 = x2) & n_indoor(x2)))