Yes there is, im also getting into enduro racing and am about to turn 15 the Sea Otter Classic is in Monterey and registration opens up in January, heres the link: https://www.seaotterclassic.com/amateur-racing-2021/ im doing the amateur because its my first race you should to i imagine or if you turn 15 after May 20-23(thats how long the event lasts) there is other enduro races to do.