Wow, @viking-ventures took all of the easy stuff....
I'm going to pretty much agree with her with a few exceptions...
I'm going to say difinately Fresno California or Growlifornia, at Chukchansi Park
The couple is standing at field level along the right field line beside the dougout, almost even with first base.
The building in the upper right corner is probably an apartment building, not enough lights on for a hospital etc.
I would also agree with the building over his right sholder being unused, I don't know about haunted, but probably an old office building.
I would say if it is after the game it is right after, as there are still several people in the stands.
The photo is taken probably early to mid september.

I'm going to go out on a limb on some guess work.
They are obviously very happy.
Here were my first thoughts.

I would say that the engagement just happened, and she is proud of that ring. She may also be pointing at something of interest on the jumbotron.
The guy is happy but has an expression on his face that tells me he is or was a bit nervous and he thinks he is one lucky man.

Another possibility which I am going to run with. They are brother and sister enjoying an awesome game that their favorite team just won.
Both are late 20s early 30s

Ok, That's all I have time for at lunch so it will have to do.