The band is performing on the football field.
Band is on the field.
In both instances the band is on a field.
exists e1 x1 x2 x3.(n_field(x2) & of(x2,x3) & n_football(x3) & n_band(x1) & on(e1,x2) & Actor(e1,x1) & v_perform(e1))
exists p1 x1 x2.(n_field(x2) & ne_geo_band(x1) & on(x1,x2))