I have a core poker group of about 25 people who meet two or three times a week to play at someone's house (my night to host is Friday night). We start out with a tournament (usually hold em, but sometimes HORSE or Omaha Hi) with a 20 to 40 dollar buy-in, sometimes with re-buys. As players bust out, the cash game cranks up. Usually 1 and 2 dollar blinds, sometimes more, sometimes less.
We've been lucky. We have clearly posted "rules" so there are almost no disputes and when there are, everyone knows the host has the final say. The only times we've ever had fights break out have been between husbands and wives and most of the time, it's not even about poker.
Of course, there's a lot of drinking, so towards the end of the night when we get down to about 5 or 6 players, you start seeing some seriously wild play.