As RS said, go on the PC website and have a look at clubs local to you. Ours certainly has all its upcoming events and rallies on there. What age is your daughter? One thing to keep in mind is to choose a club where there is plenty for your child to do at her level. I joined my little girl this year, she's just six and still on leadrein, our club is super and caters for all ages and even at her level there is loads for my daughter to take part in. Just three weeks ago she swept the board at the combined training, winning both the dressage and sj and therefore overall! She came home with three trophies! (personally I think the 'leader' had a lot to do with it....
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Whatever you choose, hope you both have lots of fun
Its usually best to ask around, see what other pony clubs people go to in your local area. Some pony clubs are quiet just stick to small rallies etc. Whereas others are very busy have lots of rallies, shows, camp etc.
Not sure if its what she wants really.... or whether to just join her in one of the local riding clubs that do lots of training.... But I feel she would benifit from doing more than the occasional clear round or summer show
She is a busy bee and I am not a very commited person, so maybe the Ponyclub would be a bit ott for us