I've been organizing the WUMP, the mastering engineer's IMP, and I think we've found a good form.
Everyone can sign up for the WUMP and if we have more than 15 participants we'll split up in groups for the commenting part. Listening to 30+ tracks is daunting but 9 to 15 tracks to comment is good to do, it'll take you an hour.
We're having one every three months, time enough for everyone to master, comment, post their tech notes and get hungry for another one
J. if you're too busy you should get someone else to organize it, I'm sure you'll find some volunteers over here. Initiatives like IMP and WUMP are of great value if you want to improve yourself.