I was first there in 1980.
Yes - we have a North American trip in long term planning, not sure when exactly - Montréal - Newfoundland - Key West - South Texas - San Diego - Alaska - Montréal (more or less). We have two Asia trips we'd like to do before then (one's on the shelf, and one's in planning), and may do others prior to NA. It will be good to visit again.
In terms of timing for your trip, I think I'd aim to be in Tuktoyaktuk at the end of September or early October - still lots of sunlight, fewer mosquitos, no concerns re recently melted snow/ice, it'll start getting colder mid-October. So you could aim for this and build around this timing for the rest of your trip - before and/or after.
PS: haven't been in Okotoks since 1990 - it was on the way to Black Diamond for the rodeo.