There are many children having fun at a party.
The kids are having fun at the birthday party.
The party is not necessarily a birthday party.
exists p1 x1 e1 x2 x3 x4 x5.((x1 = x2) & at(e1,x5) & n_party(x5) & Theme(e1,x4) & Actor(e1,x3) & v_have(e1) & n_fun(x4) & (x2 = x3) & n_child(x2) & n_quantity(x2))
exists e1 x1 x2 x3 x4.(n_party(x3) & of(x3,x4) & n_birthday(x4) & n_kid(x1) & at(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_fun(x2))