A group of people eating at a restaurant.
A group of friends eating at a restaurant to celebrate.
Eating at a restaurant does not imply that people are doing so to celebrate.
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 e1 p1 x1 x2 x3 x4.(a_topic(x1) & at(e1,x4) & Topic(x4,p1) & exists e2.(Actor(e2,x4) & v_celebrate(e2)) & n_restaurant(x4) & Actor(e1,x3) & v_eat(e1) & (x1 = x3) & of(x1,x2) & n_friend(x2) & n_group(x1))