People are at a party at night.
A bonfire party brought in a large group of people.
Just because people are at a party doesn't mean that there is a large group of people. The fact that the party is at night doesn't mean that the party has a bonfire.
exists p1 x1 x2.(at(p1,x2) & n_night(x2) & exists x3.(at(x1,x3) & n_party(x3)) & n_people(x1))
exists e1 s1 s2 x1 x2 x3 x4.(a_topic(x1) & in(e1,x3) & of(x3,x4) & n_people(x4) & n_group(x3) & a_large(s2) & Theme(s2,x3) & Theme(e1,x2) & v_bring(e1) & (x1 = x2) & n_party(x1) & a_bonfire(s1) & Theme(s1,x1))