As grouchy said, typically we have schedules raid groups on Tuesdays for the reset, and sometimes on the weekends. We try to do this so that people who want to actively raid are consistently playing with the same people. I usually post my raid groups on Sunday nights, setting up for Tuesday. If any posted times don't work for you, I encourage you to post a group signup with a time that does work, it's likely others can make that time as well. I always suggest posting the forum signup link on the clan wall as well, directing people to it.