Can a patron of my business sue me even if they signed a waiver agreeing to give up their right to sue?

Question Details:

I am starting a company that will have an annual obstacle course race for people to compete on foot. I cannot find insurance for such an event. The participants will sign a waiver stating they enter into the race fully aware of the risk involved and agree to give up their rights to sue for any potential injuries. How much protection does this waiver offer? Can they still file a civil suit against me and win?

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