People are gathered at a business conference.
People wearing clothes at video sports arena
Just because there is a conference doesn't mean it is at an arena.
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 e1 s1 x1 x2 x3 x4 x5.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & at(x3,x4) & n_arena(x4) & of(x4,x5) & n_sport(x5) & a_video(s1) & Theme(s1,x4) & n_clothes(x3) & (x1 = x2) & n_people(x1))