Motocross is held at a number of national races or just races. There organised by national clubs or regional clubs you pay between £50 to £15 to race all day but if you want an example visit www.southwestmotocrossclub.com , www.orpa.co.UK or www.southsomersetmotocrossclub.com hope this helps!
California
1970
Motocross is a form of dirt bike racing that is held on a outdoor track.
Motocross is a form of motorcycle racing held on enclosed off-road circuits. The sport evolved from motorcycle trials competitions held in the United Kingdom.[1][2] Motocross is a physically demanding sport held in all-weather conditions.
In 1885, Gottlieb Daimler and Wilhelm Maybach invented the predecessor of dirt bikes. These bikes are used in motocross racing events, The first motocross competitions were held in Britain in the 1930's,
there are many here are some: supercross arena cross motocross freestyle motocross indoor motocross outdoor motocross
Motocross, Supercross, Arenacross, Freestyle Motocross, Supermoto
Motocross, Supercross, Arenacross, Freestyle Motocross, Supermoto
motocross tracks
Supercross started in 1972 when promoter Michael Goodwin set out to create what he considered to be the “Super Bowl of Motocross”.
No one can answer that definitively, this is an excerpt from FMX. "Many people will argue as to when Freestyle Motocross (FMX) started. It’s hard to put an exact date on it because it was more of a movement that just evolved over time."
A cr250 is a motocross bike