The organizers of the fundraiser were chatting at registration.
The organizers of the fundraiser were chatting at registration about the weather.
Just because people are talking does not mean it is about the weather.
exists e1 x1 x2 x3.(n_fundraiser(x2) & n_organizer(x1) & at(e1,x3) & n_registration(x3) & Actor(e1,x1) & v_chat(e1) & of(x1,x2))
exists e1 x1 x2 x3 x4.(n_weather(x4) & n_fundraiser(x2) & n_organizer(x1) & at(e1,x3) & about(x3,x4) & n_registration(x3) & Actor(e1,x1) & v_chat(e1) & of(x1,x2))