That is how early BotFest events ran where an audience wasn't invited. I guess one person per team could work but how'd you load anything heavier than a Feather single-handed? I struggle to lift my Middleweight single-handed.

You'd also have to have a big enough space where that 2 metre rule could be maintained within the pits and I'll be honest, I don't think that'd work with a decent number of people which would include the staffing of the arena and so on. Having it outdoors creates its own set of challenges and you'd still need somewhere to have it plus without an audience and thus ticket/merchandise sales, how would EXR or RL recoup their outlay for having hired the venue? Also, it being outside might not be a starter anyway - it wouldn't be closed doors unless it was in a compound with a gate somewhere.

That might not be a problem so much for Dojo but the 2 metre rule will limit the numbers fairly substantially though that'd be the case for any event I guess.

I guess what I am trying to say is that I am open to the idea of a private event happening but I'd have serious questions over the logistics of such a thing.