People gather at a roadside park with motorcycles.
The crowd is at swimming pool.
A roadside park does not necessarily have a swimming pool, nor would you take motorcycles to a swimming pool.
exists e1 x1 x2 x3 x4.(at(e1,x2) & with(x2,x4) & n_motorcycle(x4) & n_park(x2) & of(x2,x3) & n_roadside(x3) & Actor(e1,x1) & v_gather(e1) & n_people(x1))
exists p1 x1.(n_crowd(x1) & exists e1 x2 x3.(at(x1,e1) & Theme(e1,x3) & Actor(e1,x2) & v_swim(e1) & n_pool(x3)))