A crowd of people are sitting at tables underneath a canopy.
A bunch of people are outside sitting down at tables.
crowd is a  synonym of bunch. Underneath refers to down.
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 s1 s2 x1 x2 x3.(a_outside(s2) & Manner(e1,s2) & at(e1,x3) & n_table(x3) & a_down(s1) & Manner(e1,s1) & Actor(e1,x1) & v_sit(e1) & of(x1,x2) & n_people(x2) & n_bunch(x1))