People are setting up chairs on a beach.
people having a party on a beach
Just because people are setting up chairs on a beach doesn't necessarily mean they are having a party.
exists e1 s1 x1 x2 x3.(on(e1,x3) & n_beach(x3) & a_up(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_set(e1) & n_chair(x2) & n_people(x1))
exists e1 x1 x2 x3 x4.(a_topic(x1) & on(e1,x4) & n_beach(x4) & Theme(e1,x3) & Actor(e1,x2) & v_have(e1) & n_party(x3) & (x1 = x2) & n_people(x1))