I can't make the first meeting but I imagine I will attempt to come to them occasionally (it's a bit far, but should be worth it!). My best advice is, don't make your meetings just a social event. have an agenda where there will be some content; either a presentation, or a topic for open discussion, or a theme where guys can bring something to share connected to the theme. It's a lot easier to let 'life get in the way' and skip a social get-together, but a professional skills-building event feels a lot more like something you shouldn't miss. Also, do a round of brief introductions, but DON'T give Santa the floor, some of them will hold it for 15 minutes without batting an eye. Do something like, tell us your name, where you live, and the one event you're looking forward to most this coming season (in 20 words or less). Other "getting to know you" questions we've used are favorite reindeer, favorite cookie, favorite ice cream... these short answers are good when you have a full agenda, but even with these there are some guys who will turn a 1-2 word answer into a 2-3 minute talk! Let's face it, we're a gabby bunch, in general.
My 2¢, best of luck, guys.