A group of assorted people, some standing and some sitting down, are watching the nighttime festivities.
People from the two families are watching the fireworks.
People watching nighttime festivities does not imply: that there are two families, or that they are watching fireworks.
exists e1 e2 s1 s2 s3 x1 x2 x3 x4 x5 x6 x7.(n_festivity(x7) & a_nighttime(s3) & Theme(s3,x7) & Theme(e2,x7) & Actor(e2,x1) & v_watch(e2) & of(x1,x2) & rel(x2,x3) & subset_of(x5,x3) & a_down(s2) & Manner(e1,s2) & Actor(e1,x6) & v_sit(e1) & (x5 = x6) & n_thing(x5) & subset_of(x4,x3) & n_standing(x4) & n_people(x2) & a_assorted(s1) & Theme(s1,x2) & n_group(x1))
exists e1 x1 x2 x3.(n_firework(x3) & n_family(x2) & card_eq_2(x2) & Theme(e1,x3) & Actor(e1,x1) & v_watch(e1) & from(x1,x2) & n_people(x1))