You know there's going to be some
juice sampling going on! You guys could bring some extra atomizers, so you don't get the flavors all mixed up. A cheaper idea would be for everyone to bring an empty cartridge or drip tip that you move from one atty/carto to the next.
Besides sampling and swapping, there may be someone that uses "doublers", or does some kind of DIY
juice mixing. If so, they could demonstrate how they do it for those that haven't tried it. Don't worry, I'm not talking about getting on a stage with a microphone, just sitting at a table and showing a couple of new friends how you do your thing.
Somebody may show up with an unusual piece of gear, or a big-battery mod, and be kind enough to let others try it out. That person needs to bring some extra batteries! In fact, everyone should come "loaded for bear", because your normal routine may not apply to the situation.
It sounds like fun!