A lot of the LBS's in my area offer beginner riding courses that teach things like shifting technique, rules of the road, and other various things many of us take for granted. Not to mention, the bike is fitted at time of purchase.
Granted, you are only going to get these Benny's if you purchase new from the LBS.
There is one shop that has these types of things intermittently through out the year that are open to anyone. It's a good marketing tool for attracting future customers, no matter where they bought their bike. Our local biking association has these types of things as well. You just have to pay the $25 annual membership fee.
Honestly, I feel that as experienced cyclists, we have an obligation to help new riders when the opportunity presents itself. Seriously, how much of a hardship is it to give up a Saturday to help someone you know who has just gotten a bicycle and hasn't ridden since they were a teenager? A few hours of time spent teaching basic things such as flat repair, hydration advice, how to put your chain back on, etiquette and rules of the road, and things like shifting technique. It makes for a safer rider, one who is less likely to be a danger to themselves or the motoring public, and increases the likely hood of the rider continuing in the activity.