I'm out just about every weekend and one day during the week if I can swing it. I'm on the Colorado Whitewater board so I hit most of their club weekends, too.
If you're not a member, you might want to think about joining. Its a good way to get some cheap and responsible instruction. I learned early on that you have to be pretty careful about who you boat with if you aren't familiar with the run.
We will be on the Poudre this weekend and I am pretty sure we will be taking people down the filter plant run. There are also lots of places where you could work on your roll.
We are talking about putting together a weeknight outing on the lake for roll practice, but haven't gotten a lot of interest.
Anyway, you can send me an e-mail at firstname.lastname@example.org
if you are interested in joining us for a trip.