A group of people eating at a restaurant.
A group of people at dinner together.
People eating at a restaurant does not imply that they are eating dinner.
exists e1 x1 x2 x3 x4.(a_topic(x1) & of(x1,x2) & at(e1,x4) & n_restaurant(x4) & Actor(e1,x3) & v_eat(e1) & (x2 = x3) & n_people(x2) & n_group(x1))
exists x1 x2 x3.(a_topic(x1) & of(x1,x2) & at(x2,x3) & r_together(x3) & n_dinner(x3) & n_people(x2) & n_group(x1))