I agree with your choice of Stalingrad for the greatest number of concentrated awards; but for one possible exception, which I will get to in a moment. There are a couple of reasons for this though.
Whereas the Battle of Kursk, as pointed out by Eric B pointed out in post #5, lasted two weeks, the Battle of Stalingrad took place from mid July 1942 until the beginning of February 1943 - over six months! With the exception of The Siege of Leningrad, I don’t think that there was a battle of longer duration, but awards for Leningrad are comparatively rare. I am inclined to think that awards for Stalingrad were a little more numerous because, after all, this was for “Stalin’s City”.
The possible exception mentioned in the first paragraph above would, of course, be the Battle for Berlin. By this time, the attitude towards awards had changed; and not only were they given out much more liberally but there were more of them to give out. Khmelnitsky did not even exist at the time of Stalingrad. Glory was founded in November ‘42, Suvorov, Kutuzov and Nevsky were founded in July ‘42. I suspect that these awards were so new at the time of Stalingrad that their qualification criteria was not well enough known for many awards to have been made that weren't.
Taking all of this into consideration, there is one thing that I think is worth pointing out. It often seems that, for instance, what earned a Red Star at Stalingrad would have gotten a Glory at Berlin, a Red Banner would gotten a Nevsky or, for instance, Kutuzov third class.
Just some additional thoughts,
Wild Card