A group of motorcyclists drive around a parking lot.
A biker gang is holding a rally.
A group of motorcyclists are not necessarily a biker gang and to drive around a parking lot does not imply holding a rally.
exists e1 x1 x2 x3 x4.(around(e1,x3) & n_lot(x3) & of(x3,x4) & n_parking(x4) & Actor(e1,x1) & v_drive(e1) & of(x1,x2) & n_motorcyclist(x2) & n_group(x1))
exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_hold(e1) & n_rally(x3) & n_gang(x1) & of(x1,x2) & n_biker(x2))