in the background there seems to be a lot of people around
The people are outside.
The fist sentence could take place in a large indoor environment but they are outside
exists e1 p1 s1 x1 x2 x3.(n_background(x2) & a_there(s1) & Theme(s1,x2) & in(x1,x2) & Topic(e1,p1) & Actor(e1,x3) & v_seem(e1) & exists p2 x4 x5.((x3 = x4) & of(x4,x5) & r_around(x5) & n_people(x5) & n_lot(x4)) & (x2 = x3) & n_event(x1))
exists s1 x1.(n_people(x1) & Theme(s1,x1) & a_outside(s1))