You need to talk to any prospective hotel management and let them know exactly what you're planning. They will likely be open to your bringing alcohol, but will want to charge a corking fee (per bottle). You'll almost certainly need to use their catering/food. That's actually you're leverage. You need to explain to them that you'll be having XX number of people for the dinner (that's where they'll make their money) but that you'll be using your own beer & paying a corking fee is a deal breaker. They may or may not go for it. If they balk, let them know that many other competitions in FL have arranged that sort of deal, and that you'll go elsewhere.
If you want to provide your own food as well as your own beer, look for some other sort of venue. Our club, Hogtown Brewers, moved from hotels for our comp to holding it at Kanapaha Gardens primarily so we could have better food than you get at most hotels for the same money. Good luck