I have a very pretty lop-eared lionhead buck(His name is Whiskers) who does not have a pedigree(I don't even know what a pedigree is) and is probably not purebred. Could he be a show rabbit? And if he could be a show rabbit, where would I show him?
A breed called the Miniature Lion Lop is recognized by the British Rabbit Council; you can see more information here:
https://lionlopsuk.co.uk/
However, lion lops are not officially recognized in the U.S., where shows are run by the ARBA's standards, which as
@judymac points out, you can find in the Standard of Perfection (SOP), available here
https://arba.net/product/standard-of-perfection/ As far as I know, there are no breeders that currently hold a COD; that's a Certificate of Development, which means the ARBA has given the green light to officially working on getting lion lops approved and included in the SOP. But you do see a lot of maned lop-eared rabbits around in the pet world, so it wouldn't surprise me if someone was working unofficially on them. They're pretty adorable.
@RabbitsOfTheCreek has a good idea about checking with your local fair, though. Many fairs are only loosely based on ARBA standards and accept unrecognized breeds and/or mixed breeds (which your bunny would technically be since there is no such thing as a lion lop in the U.S., other than maybe an imported M.L.L.). This is can also be true for 4-H shows.
I agree with
@judymac that a really good way to get into showing is to visit a couple of ARBA shows. You can find a listing of shows in your state (or nearby states if you live near a border) here:
https://arba.net/show-search/ You'll see a sample of the breeds shown in your area, have a chance to talk to some of the exhibitors about their breed(s), and possibly buy your own show-quality rabbit. Many breeders are happy to help youth get started in showing rabbits, and while they won't necessarily sell you a Best in Show contender (although they might - I have!), at least you might find a rabbit that will not get disqualified (DQ'd) on the show table.
Also as
@judymac mentions, rabbits don't have to have a pedigree (or any other papers) to be entered in an ARBA show, but if you get a pedigreed rabbit, you'll know it's purebred and a recognized breed. Do be aware, though, that a pedigree does not necessarily mean it will be showable - a pedigreed rabbit can still have DQs.
Showing your own rabbit and listening to the judges' comments - more than one judge, as they all have slightly different impressions and interpretations on the standards - is one of the very best ways to get up to speed on recognizing rabbit breeds, understanding the standards and developing an eye and feel for what makes a good show rabbit. But even going and just watching judges evaluate others' rabbits is helpful (and fun, if you like rabbits!).