Man talking to a crowd of people in an expo style setting.
The demonstator had a product that everyone wanted.
Not every man talking to a crowd is a demonstrator and does not imply he has a product that everyone wanted.
exists e1 s1 x1 x2 x3 x4 x5 x6.(a_topic(x1) & to(e1,x3) & in(x3,x5) & n_setting(x5) & of(x5,x6) & n_style(x6) & a_expo(s1) & Theme(s1,x5) & of(x3,x4) & n_people(x4) & n_crowd(x3) & Actor(e1,x2) & v_talk(e1) & (x1 = x2) & n_man(x1))
exists e1 x1 x2.(n_demonstator(x1) & Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & all x3.(n_person(x3) -> exists e2 x4.(Theme(e2,x4) & Actor(e2,x3) & v_want(e2) & (x2 = x4))) & n_product(x2))