People are gathered at a business conference.
The people are all men.
Just because there is a conference doesn't mean they are all men.
exists e1 x1 x2 x3.(at(e1,x2) & n_conference(x2) & of(x2,x3) & n_business(x3) & Theme(e1,x1) & v_gather(e1) & n_people(x1))
exists p1 x1.(n_people(x1) & all x2.(n_man(x2) -> (x1 = x2)))