What can they possibly sue you for if they agreed in a waiver that they wouldn't? I mean, they already acknowledged that it is not HIPAA compliant, so what medical information being leaked in a summer camp registration could possibly cause any damages that they could sue for? That's just stupid. I mean, some hacker finds out that their Johnny wets the bed due a medical reason. That doesn't cause damage.
You will want a legal professional drafting any waiver of liability for you, to best protect you from losing a lawsuit, and you will want insurance enough to cover the costs of both a lawsuit and a lawsuit loss.
A carefully-drafted liability waiver will inform a consumer of all of the possible risks involved in doing business with you and, by signing the waiver, the consumer agrees not to hold you personally responsible if something does in fact go wrong
that was not due to your own gross negligence. A liability waiver generally will
not protect you from your conscience disregard for the consumer’s safety.
But, waiver or not, you cannot prevent someone from suing you, for whatever reason they want. That is why you get insurance.