As far as I can remember there are no campsites within a reasonable distance of the Winter Gardens. Here are contact details of the local scout camp site and I believe they might let you camp there. It's about a 10 minute walk from the do.Also I would have thought the organisers would be providing at least one bus to and from the event? There are loads of BnB's in Ventnor and if you wanted one of them you'd probably get one when you get down there. As kids we used to camp on the cliff top
Julie on 01983 401102, or e-mail
julieq@keeler.co.uk