A gathering of many people.
There is a large gathering of people.
Both are of a gathering of people.
exists x1 x2.(a_topic(x1) & of(x1,x2) & n_people(x2) & n_quantity(x2) & n_gathering(x1))
exists p1 x1 s1 x2 x3.((x1 = x2) & of(x2,x3) & n_people(x3) & n_gathering(x2) & a_large(s1) & Theme(s1,x2))