Yea I am not sure what happened with that, it was advertised as 21+, but a slip and slide is basically a magnet for kids.

They eventually tweeted out that kids can go down the slip and slide if their guardian signs off on the waiver for them.

So it turned out the only area that was 21+ was the actual beer garden (deep deuce grill's parking lot). I was pretty surprised at the amount of kids that were present.