Though the previous comment is correct, these problems in Calgary are not totally unbearable.
It might be hard to find a certain brand of your favourite alcohol once in a while, but everything else will be in stock. As for taxis, the night rush isn’t great, but calling ahead helps, and there are companies that drive those drinking home for free. The rest of the time taxis shouldn’t be difficult to get a hold of.
Parking downtown during the day is honestly horrible. I’ve seen places advertising at $15 for an hour and a half, and thats if you can find a parking spot within a couple miles of your destination. Your best bet is parking at the C Train station and taking it down through the free zone to wherever you are going.