It really is worthwhile to try to be there some time at least partially overlapping the dates Chris will announce, when he is able to. You should definitely tour with Chris your first time on Powell, you will see all the "must see" sites. And if you can go with Bill, you will learn more about the geology of Powell, which is absolutely fascinating.
We may not all cruise together in a big group, in fact didn't last year and almost surely won't again this year, but you do not want to miss at least one of the two rendevous! (Yes, folks, I Googled it, and the plural of "rendevous" is..."rendevous"). I am thinking we will be there the weeks of September 20 and 27, we would take off Friday September 17 and be back at the salt mines Monday October 4th. We will probably launch at Bullfrog again this year too.
A hint - if you are 60 or older, get your $10 lifetime Geezer Pass, it will save you a few bucks on entry to Glen Canyon National Recreation Area and any other national recreation area. We got ours at the local Forest Service Ranger Station, I think you can get it at the gate at Powell, but I am not sure.