People congregate on a platform in a river among decorated boats.
People are wearing life jackets.
People wearing life jackets do not necessarily have to be on a boat.
exists e1 s1 x1 x2 x3 x4.(on(e1,x2) & in(x2,x3) & among(x3,x4) & n_boat(x4) & a_decorated(s1) & Theme(s1,x4) & n_river(x3) & n_platform(x2) & Actor(e1,x1) & v_congregate(e1) & n_people(x1))
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & n_jacket(x2) & of(x2,x3) & n_life(x3) & n_people(x1))