A LOT of smaller venues will have a 4 wire, 120/240 single phase, 50A twist lock "California Style" receptacle (the same that spider boxes take on the jobsite). There is usually only one, but a few of them will have 2 or 3. Most sound/lighting companies will be able to adapt to this. Unfortunately, a lot of these community venues just have a bunch of standard receptacles buried in a shed, and you have to run a bunch of 12/3 cords to them. As stated, a show power disco or camlocks are common too, but this may be overkill for a small stage. Most of these have modest sound and lighting requirements, and if a huge rig is being brought in for a special event, they'll usually rent a generator as well. You really don't want camlocks and disconnect "tails" around unless you have a resident tech that is qualified. People will find a way to mess up even the most foolproof setup when the "show must go on".
mike
