I can't understand why your comment would be downvoted. User group meetings, conferences, dev get-togethers are all ideal for talking to people about what OP suggests: "estimate your market value". Please job interviewing just sucks the life out of anyone - it is absolutely no fun for all parties. Why make 1-2 days of your life suck per year just to "estimate your market value" when there are more fun ways to do it?