Oh Fests... how i loath thee...
I've done side stages at Warped Tours before as well as a TON of other smallER fests, but still talking thousands of kids comming out. i hate them. I am a tremendously sociable person but fests are like sensory overload for me and i usually find myself hanging out at merch booths instead. This is also due to us getting wrongly booked about 95% of the time. All three of us in the band were straightedge, but we weren't "one of those straightedge bands". So we usually got booked on those kinds of fests that have about 13 hours straight (lol pun) of kids ninja kicking eachother. Then we would play and scare/tick off everyone... then sit arround some more... *sigh*.
As for fest playing tips:
1. Do NOT worry too much about your sound. At these big fests, and especially smaller stages, the sound people are primarily there to get you on and off as quick as possible. The last thing you want to do is harp over each minute sound for too long while kids grow impatient. Impatient kids = bad reaction.
2. Be energetic!!!! I can NOT stress this enough. As a musician and a fan, one of the things i simply will not tolerate are bands that are statues. Move around. Be exciting. Make eye contact with people. I don't know... maybe this is because i grew up going to shows like Jerome's Dream, Swing Kids, Antioch Arrow, Orchid, Pg99... but these bands REALLY got into it live and it just made the energy so wonderful.
3. Wander arround and talk to people before-hand. The only saving grace i found for fests is the ability to meet new and interesting people. Don't just chill out at your booth. Talk to other bands, talk to kids. Tell everyone to check your band out.
4. Don't be nervous. Cliche i know, but honestly, don't be nervous. Fest audiences are about the LEAST scrutinizing audiences you will ever play in front of, so relax and have fun!
5. If you are of the substance using persuasion... wait until AFTER you play. I hate seeing bands stumbling around while they play.
I dunno. I think that's okay for now. Just relax and have fun! I am sure you will do great. Playing metalcore in Florida is about as "preaching to the choir" as you can get. You WILL be well recieved, maybe just remember some of these things and you can surpass just "well recieved" and really stand out!
Good luck!!!