A gathering of people taking pictures.
Some tourists are taking pictures of something interesting.
A gathering of people does not necessarily mean tourists and just because they are taking pictures, does not mean it is of something interesting.
exists e1 x1 x2 x3 x4.(a_topic(x1) & of(x1,x2) & Theme(e1,x4) & Actor(e1,x3) & v_take(e1) & n_picture(x4) & (x2 = x3) & n_people(x2) & n_gathering(x1))
exists e1 s1 x1 x2 x3 x4.(of(e1,x3) & Theme(s1,x4) & a_interesting(s1) & (x3 = x4) & n_thing(x3) & Theme(e1,x2) & Actor(e1,x1) & v_take(e1) & n_picture(x2) & n_tourist(x1))