Various people are seated in chairs before some sort of indoor event.
the people were on concrete
are and were are different tenses
exists e1 s1 s2 x1 x2 x3 x4.(before(e1,x3) & of(x3,x4) & n_event(x4) & a_indoor(s2) & Theme(s2,x4) & n_sort(x3) & in(e1,x2) & n_chair(x2) & Theme(e1,x1) & v_seat(e1) & n_people(x1) & a_various(s1) & Theme(s1,x1))
exists p1 x1.(n_people(x1) & exists x2.(on(x1,x2) & n_concrete(x2)))