Urban life, huh? Well, see? I have no idea what I'm doing.
I think your first two images are a little soft. I think all the images are very similar ... between knees and head. Would be nice to have a headshot of one or two of them. If I am seeing most of an instrument, such as a guitar, I prefer that the end not be cropped off. I would like to have seen one wide angle, sorta get the gist of the whole group. I hope you take this all as constructive criticism. I think if you go back to the Q&A thread and maybe check out Steve Parr's, JF's and Benny's stuff you'll also get a sense of what most of us like. Event photography is very difficult. And everyone wants something different. You don't get to control anything! It's not like family pictures, or weddings or portraits or landscapes or macros or glamour or bird pictures. It is pretty close to Sports, which is another forum I check out very regularly. BTW, what camera and lenses are you using?
Brilliant thoughts, Dwight. Thank you. I see what you're talking about with the similarity...I can do better than that. As for soft, yes, I think I see what you mean in the lady's shot - which, btw, is my least fav of the bunch - but I'm not sure what you mean with the first one. Maybe I'm just blind tonight...
As for a headshot - yes, I agree, but that meant I'd have to be on the stage with them, and that was off-limits. Maybe next time...and there is another event coming up that I can shoot - a live concert - so I'm learning now, and maybe I'll get to show you some improvement after that show.
As for the equipment, as I said, I wasn't going to bring my camera. But then I did, but only the nifty fifty, as I wasn't expecting this opportunity to be present; just some shots of family and friends in the picnic before hand. So it was just the 20D and the nifty fifty...nothing else. All handheld, as well. And I wish I had brought other lenses - I have several, I just didn't expect to be wanting to use them. And yet another lesson learned...
Thanks, Dwight. I really appreciate the critique, and have learned a bunch. 
Best-
Noni