A varied crowd mills about (or rough-houses) on a public street, with lots of bicycles on display.
The people are at a bike race.
Bicycles on display and a crowd does not imply a bike race.
exists s1 s2 s3 x1 x2 x3 x4 x5 x6 x7.(a_topic(x1) & with(x1,x5) & of(x5,x6) & on(x6,x7) & n_display(x7) & n_bicycle(x6) & n_lot(x5) & on(x1,x4) & n_street(x4) & a_public(s3) & Theme(s3,x4) & about(x1,x3) & n_rough-house(x3) & a_((s2) & Theme(s2,x3) & n_mill(x1) & of(x1,x2) & n_crowd(x2) & a_varied(s1) & Theme(s1,x1))
exists p1 x1.(n_people(x1) & exists x2 x3.(at(x1,x2) & n_race(x2) & of(x2,x3) & n_bike(x3)))