A group of people are attending a conference.
People from an office building are attending a work conference.
Not all conferences are about work.
exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_attend(e1) & n_conference(x3) & of(x1,x2) & n_people(x2) & n_group(x1))
exists e1 x1 x2 x3 x4 x5.(Theme(e1,x4) & Actor(e1,x1) & v_attend(e1) & n_conference(x4) & of(x4,x5) & n_work(x5) & from(x1,x2) & n_building(x2) & of(x2,x3) & n_office(x3) & n_people(x1))