Just went through this in Calgary. Here's the trick. They typically post updated timeslots (cancelations and new ones) 12:00 AM Wednesday Morning. They do some other nights as well but that seems to be the most consistent.
So on Tuesday you stay up until midnight and log in the second the clock turns. If there are times posted, grab one quickly. If you wait 15 minutes to scroll through the 15 timeslots that might be there, by the time you pick one it will be gone. Kinda like buying concert tickets in the olden days when there was concerts! It's a pain and is exhausting as there were several weeks where we'd be staying up until 12:30 each night, checking every night and both trying to login and book it. So based on my experience, Tuesday evening you poured a whiskey, watched sports highlights and waited for login time.
The timeslots for around Calgary anyway, were typically morning slots a week to 10 days out. We had to do this 3 times as my lad had a bit of bad luck and brain farts the first two times, but got it now!
Hopefully you can get booked (note that is was the instructor after the first try who told us to try midnight)
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