I mean how do you get into that and how do you organize that many people to do it? And where do you do it?
You basically have to either know someone who does it and they help you get into it, or you can generally walk into the camp at an event and let a unit know that you're interested in reenacting and they'll usually suit you up with some loaner gear and take you out with them that day.
We're all members of our own companies and regiments, and we schedule our different events throughout the year that we want to go to, so you're usually there with your regular group of guys. The event hosts basically just circulate information about an event that they want to have, and the different units sign up saying they'll be there.
I travel all over the state doing the events with my unit, which we have around 2 events a month between September and April (too hot during the summer). Typically, we do one or two out of state events a season, this year's being the Battle of Atlanta this past November and the 145th Gettysburg this upcoming July.
Actually it depends on the event and the day. If it's just a generic event (ie, not an actual reenacted battle or a national event) down here in the South, the Union usually wins on Saturday and the Confederates usually win on Sunday. If it's a scripted battle, obviously we follow the way it actually went, and the result is historically accurate. Then we also have tactical battles, where we get to pretty much have to plan out our strategy, play it out and see who comes out on top.