I could force it to randomly assign teams when people join! Although I don't remember what the cvar for that is. :P
I do need to make sure my event server copy of TF2 has an up-to-date SourceMod install.
If I use my main server's copy, we'll end up with stats logging mods and stuff in place.
Which is redundant, since the stats tracker is configured to ignore logging from servers other than the two TF2 servers monitored here: ocrtf2.com/stats