Our family did the Canadian Rockies
ABD in 2019. This was the only ABD we have ever done without a US guide... in 2019 they had 4 guides, all were Canadian and they ran the trip in pairs back to back from late June to August.
We went in July and the weather was chilly - it rained on the first day of the trip and many in our group had to buy extra layers in Calgary because we weren't prepared for the cold.
There is the Stampede festival in Calgary that time of year which may be of interest - Calgary has a strong Western vibe, much like Ft. Worth, Texas if you're familiar. Banff and Lake Louise are breath taking. We did a mead (fermented honey) tasting, a bike right, a glacier hike, a raft tour in Canmore; we also did the hike to Agnes' Tea House by Lake Louise.
Aside from the views, I personally didn't find much "extraordinary" about the trip. The trip got me to read a bit about Canadian history which I enjoyed. The scenery was spectacular! The food and activities were decent - but honestly not as memorable as the other ABDs we had done. We picked it primarily for the views, the proximity to the US and less jet lag. Let me know if you have any specific questions. Hope that helps.