I know the type of fencing mask I need. That's a question that I have found answered many times in many places. But should I bring gloves as well? What kind would you recommend?
Hockey gloves are too much. I fight in leather work gloves. I think I've seen Guro Poi Dog fight in batting gloves. In eather case, there's no real padding to speak of. Pappy Dog makes a fine pair of gloves that offer less padding than hockey gloves, but more than work/batting gloves. I've seen many people fight while wearing them.
Beyond that, MAKE SURE you have groin protection. I also wear light elbow and knee pads. I would bring all the sticks you have. You might surprise yourself and want to fight with a different stick than you've been training with/planning to use.
All of the resources being suggested are excellent places to begin to fill in what you perceive to be holes in your game. Your participation will reveal more. That's just the way it goes.
What I can offer is perhaps philosophical. If you're nervous the day of, know that nerves (chatter) is a part of the experience. Also, in my experience, the fighters offer a rare opportunity; it's a group of people who are seeing things exactly as you are. I have never intereacted with anyone at a Gathering who didn't
1. have a great sense of humor
2. go out of their way to make sure I knew that even though we would be fighting with minimal protection and rattan sticks, they had my back in a manner of speaking. That is not to write that they would "take it easy" on me, but that they could show me my limitations without breaking me.
Other than that, try to stay present. Watch the other fights. Be a part of things. Yes, after a fight it's okay to get your breath, assess any damage, and talk with your last partner about what just took place. Beyond that, be part of the fighters and watch the other fights!
The majority of the people in the venue will be spectators. You will not be. You're a participant. Even if you're not one of the people engaged in the current fight, you are still involved in the day on a deeper level than the folks in the seats. When you finish your first knife fight, or your first stickfight of the day, and your nerves quiet, try to enjoy yourself and appreciate the day.