People are gathered at a business conference.
People are at a meeting.
A business conference is a meeting.
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.(exists x2.(at(x1,x2) & n_meeting(x2)) & n_people(x1))