They really are working weekends. Received my conditional approval today, letter dated 7/31!

I'll try to run through the more notable interview center times in the rest of this post. Note I won't be keeping this post current, so consider this a snapshot overview as of 7/31. Of note, Mondays seem to be quite popular everywhere:

Seattle is full until January 2017

Sweetgrass, MT is full for August, not available until September 6

Derby Line, VT not available until mid-November

Detroit not available until next week

Halifax not available until mid-September

YUL not until mid-August

YOW not until beginning of September

YYZ is available for a few times this week, but sparsely after that

All others not mentioned specifically are relatively widely available for August and onward. Some (e.g. Sault Ste. Marie) are practically wide open.