As Moresound says, I don't think anyone objects to some live sound discussion in here.
However, if you want a forum that deals specifically with the live entertainment industry, I'm a mod over at the
BLUE ROOM TECHNICAL FORUM. It deals specifically with live stuff and has sub forums for all the main tech areas....lighting, pyro, electrics....and, of course, Sound. There's also a section called "The Next Generation" where beginner level questions are welcome.
The only things I should mention are that it's more tightly moderated than this one...and UK based so, though the technology will be the same, it's not the place to go for specific US prices and stores.
A couple of other places:
Dave Rat's "Rat Sound" has a forum
HERE. It's been kinda quiet of late but might be worth a try.
The other place to look at would be the
LAB (LIVE AUDIO BOARD) over at ProSoundWeb. I've never managed to get into it over there--a bit cliquey and full of rules for my liking but it's likely the biggest live board around.
Bob