People are gathered at a business conference.
People at business conference
"People at " is a rephrasing of "People are gathered at "
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 x1 x2 x3.(a_topic(x1) & at(x1,x2) & n_conference(x2) & of(x2,x3) & n_business(x3) & n_people(x1))