The organizers of the fundraiser were chatting at registration.
The organizers were chatting at registration.
It is explicitly stated that the organizers were chatting at registration.
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.(n_organizer(x1) & at(e1,x2) & n_registration(x2) & Actor(e1,x1) & v_chat(e1))