Blue collar workers at a convention.
they workers are at a building
THE CONVENTION IS IN A BUILDING.
exists s1 x1 x2 x3.(a_topic(x1) & at(x1,x3) & n_convention(x3) & n_worker(x1) & of(x1,x2) & n_collar(x2) & a_blue(s1) & Theme(s1,x1))
exists p1 x1 x2.(n_thing(x1) & exists x3.(at(x1,x3) & n_building(x3)) & Time(x1,x2) & n_worker(x2))