Went to a Stanford MBA Program Alumni Briefing in my city the other night - found it very helpful. First, the panel was held in McKinsey's office, which was very cool to see, since I've never seen that. There were 3 women on the panel, and they went through a quick slide show explaining what Stanford is about, what they enjoyed, etc. Later, they opened it up for an informal Q&A, and helped provide insight into their experiences at GSB.
Overall, it was a cool experience. I highly recommend attending one in your city/nearby city if you can.