in hants we used (i no longer live there) to run out of school activity programmes and a summer holiday scheme with 1-1 (or even more in some cases) care.
tbh we rather hoped that the extended schools programme would remove this responsibility away from the voluntary sector. parents of children with disabilities ought to be able to access suitable childcare, rather than organise it themselves however successfully!
but kudos for getting on with it and making it a viable setting.
we also used to (again, they still do, i'm just not there any longer) sponsor an sn only performance of the local town panto, and sell tickets only to children with disabilities and their immediate family at huge discount. we provided drink, snack and light-up toy, and the performances were often changed subtley to remove any innapropriate content (flashing lights/ extreme noise ie thunder/ lightning/ storm). we used to remove an entire block of seats to increase wheelchair spaces. the panto crew always said the best performance was the sn one. they used to come out afterwards so the kids could get photos taken.
it was pretty much the only way that some kids could access a panto - there was no tutting if your child made noise, no tutting for kids who needed to go out and come back in twelve times, just understanding, and at such a reduced price that even if you lasted five minutes before you had to leave, at least it didn't break the bank.
we also used to put on family events in other holidays. ran festivals etc. dance, drumming, brilliant sn sound wall, (fab 'ballet for you'), drama, craft.
i just think it's a crying shame that so often these things are put together by unpaid volunteers who are ordinarily carers themselves. but i suppose that's what happens when capable parents are unable to hold down f/t demanding jobs because of their caring responsibilities!