rrblint - Any suggestions on which way to look? They are all large JPEGs, so there is no RAW adjustments to be made.
Since the RAW files are not available the corrections can still be made but will be more difficult and less effective than would be the case if the RAW files were available.
In order to "save" the shots that you have, the main problems(other than focus, which you can't do much about) that must be fixed are:
1.) The exposure on the players' faces needs to be increased.
2.) The white balance needs to be warmed.
I don't know what software you are using to adjust your JPEGs, but I'm sure that whatever it is, you can find "exposure adjustment"(or maybe "brightness") and "white balance adjustment" in the controls somewhere.
If you are unaccustomed to PP work, you may have to read a manual or view a tutorial on how to do it.