A crowd of people are sitting at tables underneath a canopy.
A group of people are eating at a wedding banquet.
A group of people sitting at tables does not necessarily mean that it's a wedding banquet; it can be any kind of party.
exists e1 x1 x2 x3 x4.(underneath(e1,x4) & n_canopy(x4) & at(e1,x3) & n_table(x3) & Actor(e1,x1) & v_sit(e1) & of(x1,x2) & n_people(x2) & n_crowd(x1))
exists e1 x1 x2 x3 x4.(at(e1,x3) & n_banquet(x3) & of(x3,x4) & n_wedding(x4) & Actor(e1,x1) & v_eat(e1) & of(x1,x2) & n_people(x2) & n_group(x1))