We tend to standardise on tension locks by default. However the principle we used last time that works is that you are responsible for bringing complete trains to run.
Therefore, if you bring a train with kadees, then your loco and stock (unless others have bought them) are the only things you can play with, rather than user A dropping wagons and user B taking them forward.
We only have a small number of people, and unknown modules, at the moment - last time most of it was single track with passing places too, meaning there wasn't a lot of "playing trains", more "run from A to B then back again".
I have no problem with a few of you bringing compatible non-tension locked stock, and working out your own system of cards, computers or whatever to give wagons a purpose - I have no knowledge of such operations so it'd be up to you to organise and within the general melee of how things run.
I'll be booking the hall, administering bookings, taking money, and (with discussion) putting together the layout of how things go together on the day. Everything else is flexible, as long as we are clear in advance and everyone knows what they're doing. If a couple of you want to discuss in PM kadee-based freight operations to run on the day that's fine, the rest of us can just run our passenger services along and you can slot inbetween - just like the real thing tends to.
Oh I guess we ought to talk controllers as well. Last time I bought along my Lenz based system with a couple of controllers and laptop through JMRI with some WiThrottle connections. Do we stick with this, or do the majority of you have other controllers you can provide with someone else responsible? A WiThrottle link would be most handy.