Well we can schedule one every month and see how we go. I sometimes think the timing of around 6 weeks makes it too long if you miss one.
But, in my opinion, we'll need to mix it up a bit between Saturday and Sunday, some may be 3 weeks between, others 5 weeks to try and cater for schedules.
Also, how many overnight RTEs are you interested in? There are currently 4 listed (Tumby Bay inc.), but some other suggestions could be overnight depending on rider's choice.