A group of people are standing at a concert.
People are gathered.
the concert gives context to where the people are gathered
exists e1 x1 x2 x3.(at(e1,x3) & n_concert(x3) & Actor(e1,x1) & v_stand(e1) & of(x1,x2) & n_people(x2) & n_group(x1))
exists e1 x1.(Theme(e1,x1) & v_gather(e1) & n_people(x1))