I did open solo in Dallas in November and I'm doing doubles on Sunday afternoon this weekend.
-Hopefully you have identified what events will be your strengths and weaknesses and plan accordingly. Just because it's a strength, stay under control. For example, sleds are my strength, but I went too hard on push and actually ended up with my slowest run afterwards. Yes, I was in the top 10% of sled push times, but probably should have paced better.
-Don't go out hot on the 1st couple runs, it's a long race.
-Don't walk in the Rox zone if you can help it, keep jogging.
-I take a gel on the run into the row.
-Get there early to just walk around and see the layout. There will be a lot of energy in the room so don't get caught up in it. Get warmed up, but nothing more than your usual. There will be dudes overdoing it in the warmup area, but don't get caught up in it. The adrenaline of the tunnel was the first real sense of competition I've felt in years. That's the main reason I'm going back.
-Wall Balls are terrible and I hated my life. Don't to failure, pace it out in comfortable sets.
-Make sure you keep track of your laps, I think this is a 3 lap setup, they are typically 2.
Good luck and have fun, it's going to suck though.