Experience has proved trying to organise a regular weekend ride-out doesn't work. I'll be quite happy to be proved wrong though. It'll only take once or twice for people to turn up, find they are the only ones turning up, and then not bother again.
Much better to start a new poll each week for who is up for a ride. Hell it'll even get stickied until after the event.
Oh and as most know on here. Weekends for me are normally family orientated. Happy to try and get a midweek ride in now and then though.