Most art instruction books are worthless. Especially anything declaring it can teach you "how to draw manga." Stay away from that junk.
Ronin and Rini really hit the nail on the head. Working on your own is great, but there's nothing that can compare to focused, educated instruction. If you want to be a good artist, it's probably not going to happen from random meetups. You need real teachers who teach real principles in order to hone your skills. People usually charge to teach things like that, and rightly so--these skills are acquired after a lot of training and hard work! So take some art classes. Pay people to train your eye. They'll help you dramatically in ways that nothing else can.

That said, I do like the idea of meeting up to draw. It could be a lot of fun to have a chance to
apply what you know and have learned with other artists in an informal drawing session. So I do have a suggestion, if anyone would be more interested in just doing drawing sessions without necessarily the "formal instruction" part. I've been to a number of different clubs and classrooms where you can just walk in, sometimes for a fee, and draw a live model with other artists. I always thought it would be really fun to get a cosplay model for figure drawings, just because of how... well-styled they are, how unusual their costumes. And, if there's anything that would be both useful and fun for artistically inclined nerds, that would be a good place to start.
I don't know how suitable or possible it would be for a panel, but if anyone wanted a meetup on some Saturday or something, I would be there.
