A woman is pouring drinks at an event.
A woman is at an event.
One woman is pouring drinks at an event and the other is just at the event.
exists e1 x1 x2 x3.(at(e1,x3) & n_event(x3) & Theme(e1,x2) & Actor(e1,x1) & v_pour(e1) & n_drink(x2) & n_woman(x1))
exists p1 x1.(exists x2.(at(x1,x2) & n_event(x2)) & n_woman(x1))