a social event taking place in the grass.
A company picnic in a park.
Not every social event is a company picnic and in the grass does not imply being in a park.
exists e1 s1 x1 x2 x3 x4.(n_grass(x4) & a_topic(x1) & in(e1,x4) & Theme(e1,x3) & Actor(e1,x2) & v_take(e1) & n_place(x3) & (x1 = x2) & n_event(x1) & a_social(s1) & Theme(s1,x1))
exists x1 x2 x3.(a_topic(x1) & in(x1,x3) & n_park(x3) & n_picnic(x1) & of(x1,x2) & n_company(x2))