These people are putting on a performance.
People are having a performance.
Having a performance is a rephrasing of putting on a performance.
exists e1 x1 x2 x3.(n_people(x1) & on(e1,x3) & n_performance(x3) & Theme(e1,x2) & Actor(e1,x1) & v_put(e1) & n_thing(x2))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_performance(x2) & n_people(x1))