A lot of people are attending an aviation exposition.
A crowd of people at an airshow.
when  the people are in the airshow that doesn't mean that they are attending only  an aviation exposition
exists e1 x1 x2 x3 x4.(Theme(e1,x3) & Actor(e1,x1) & v_attend(e1) & n_exposition(x3) & of(x3,x4) & n_aviation(x4) & of(x1,x2) & n_people(x2) & n_lot(x1))
exists x1 x2 x3.(a_topic(x1) & at(x1,x3) & n_airshow(x3) & of(x1,x2) & n_people(x2) & n_crowd(x1))