People are gathered at an event in the city.
People are gathered.
An event in the city implies people are gathered.
exists e1 x1 x2 x3.(n_city(x3) & at(e1,x2) & in(x2,x3) & n_event(x2) & Theme(e1,x1) & v_gather(e1) & n_people(x1))
exists e1 x1.(Theme(e1,x1) & v_gather(e1) & n_people(x1))