premise: people are enjoying food at a crowded restaurant.
hypothesis: The people are celebrating their father's birthday at a local restaurant.
explanation_1: People enjoying food at a restaurant does not mean they are celebrating a birthday or anything for that matter.  Just because the restaurant is crowded does not mean that it local to the people.
explanation_2: There is no indication there is a father's birthday celebration, or that the restaurant is local, or that the people even know each other.
explanation_3: The people could have been out of town instead of eating at a local restaurant. The people may not even know each other, let alone celebrating their father's birthday.
premise_logic: exists e1 s1 x1 x2 x3.(at(e1,x3) & n_restaurant(x3) & a_crowded(s1) & Theme(s1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_enjoy(e1) & n_food(x2) & n_people(x1))
hypothesis_logic: exists e1 s1 x1 x2 x3 x4.(n_birthday(x3) & of(x3,x2) & n_father(x2) & of(x2,x1) & n_thing(x1) & n_people(x1) & at(e1,x4) & n_restaurant(x4) & a_local(s1) & Theme(s1,x4) & Theme(e1,x3) & Actor(e1,x1) & v_celebrate(e1))
premise_sim: exists e1 s1 x1 x2 x3.(v_enjoy(e1) & n_restaurant(x3) & n_people(x1) & n_food(x2) & at(e1,x3) & a_crowded(s1) & Theme(s1,x3) & Theme(e1,x2) & Actor(e1,x1))
hypothesis_sim: exists e1 s1 x1 x2 x3 x4.(v_celebrate(e1) & of(x3,x2) & of(x2,x1) & n_thing(x1) & n_restaurant(x4) & n_people(x1) & n_father(x2) & n_birthday(x3) & at(e1,x4) & a_local(s1) & Theme(s1,x4) & Theme(e1,x3) & Actor(e1,x1))