This has become an issue in my band as of late. The singer and I are OK with practicing weekly -- we just like to play, and generally have nothing better to do on a Saturday night. Drummer has a little kid at home, so his free time is harder to come by. If we schedule a practice, he can usually make it. The problem is with the lead guitar player. He has an irregular work schedule, and practices are scheduled around his availability. He also needs the most work getting/staying up to speed. His retention just sucks (he's recently returned to playing/gigging after 20+ years off), even after we think we have a song down cold. Drummer is getting fed up. He's got better things to do than get together once a week to see if the guitar player has his act together. I'm afraid if we don't have weekly band practice, the guitar player will slip. Drummer doesn't want to practice at all unless everybody has the material down cold. It's a matter of setting expectations and holding people accountable. I'm lucky to be in a band where we're all really good friends. Hopefully we can get this sorted out before it becomes a fatal problem.