people are dancing and enjoying.
a group of people are dancing in a party
People can be dancing and enjoying anywhere and not just in a party.
exists e2 e1 x1 x2.(Actor(e2,x2) & v_enjoy(e2) & n_people(x2) & Actor(e1,x1) & v_dance(e1) & n_people(x1))
exists e1 x1 x2 x3.(in(e1,x3) & n_party(x3) & Actor(e1,x1) & v_dance(e1) & of(x1,x2) & n_people(x2) & n_group(x1))