A big group of people are enjoying a public event.
There is nobody enjoying a public event.
at the event there is either a big group of people or nobody
exists e1 s1 s2 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_enjoy(e1) & n_event(x3) & a_public(s2) & Theme(s2,x3) & of(x1,x2) & n_people(x2) & n_group(x1) & a_big(s1) & Theme(s1,x1))
exists p1 x1.-exists e1 s1 x2 x3 x4.((x1 = x2) & Theme(e1,x4) & Actor(e1,x3) & v_enjoy(e1) & n_event(x4) & a_public(s1) & Theme(s1,x4) & (x2 = x3) & n_person(x2))