The Colorado Audio Society gets together pretty often. The next event will be at Teres Audio, hosted by Chris Brady the owner. Chris is one of the truly good guys and has a pretty amazing system. He is Mr. DIY when it comes to electronics. The CAS site is:
http://www.coloradoaudiosociety.org/Chris's system:
http://www.teresaudio.com/haven/I tend to have folks over a couple of times per year but this summer is out for me as I had ankle surgery three weeks back.

However, if you live in the south end of town I'm always willing to have guests. I'm south east of Parker, towards Elizabeth, out in the country. Shoot me a PM or email if you'd like to drop by. My system is currently a much hacked Squeezebox with a tube output stage or a Teres/Morch/Benz/Hagerman Cornet feeding a DIY preamp -> McIntosh 275 or Audio GD Zero dB SS amp. -> Geddes Abbey speakers w/3 subs in a dedicated room.
Mike