A group of people at a festival.
The people all know each other.
Just because  A group of people at a festival does not mean they all know each other.
exists x1 x2 x3.(a_topic(x1) & of(x1,x2) & at(x2,x3) & n_festival(x3) & n_people(x2) & n_group(x1))
exists x1.(n_people(x1) & all x2.(n_other(x2) -> exists e1 s1.(a_all(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_know(e1))))