As far as pitching tents on concrete or other hard surfaces... Often there is a way to improvise something like cords to legs of picnic tables, poles, or off the edge of the concrete. If the surface is a wood deck there are often spaces between the boards that allow for cords with twigs underneath.

Also often if on a concrete surface you are also under a roof so you really don't need rain protection, so you can get by with less than a full pitch of the tent. No fly and maybe just the mesh inner body held up off you or even just off of your face. The remainder of the tent could lay on your sleeping bag and any gear you bring inside. As little as a single cord to a rafter might suffice. I've never needed to resort to that with a tent, but I have often used a bivy that way and see no reason why the tent wouldn't function just fine for sleeping in that mode.

Truth be told if under a roof I wouldn't bother with the tent at all unless the bugs were biting. That is one advantage of the bivy you can decide not to use it if the weather looks good or you are under a roof and it only takes a few seconds to climb in if the bugs start biting.

Maybe it isn't for everyone but I really like cowboy camping when conditions allow and the bivy is great for a quick bail out if they turn bad on you. On those nice nights I also keep the tarp handy to pull over me and my gear if not under a roof. Obviously if bad weather seems likely and there is no roof, the tarp is pitched and ready to start with.