Some shows are now judged on a point system (the Maine Quilt show is one). The judges have a sheet with the shows judging criteria on it and points are given for each item on the list. The three judges sheets are added together, divided by 3 and a total point score is given to each quilt.
Ribbons are given to all quilts within whatever range is assigned to that level. So, yes, there can be any number of blue ribbons that way (including none). The purpose of this system is to eliminate competition between individuals and make the judging more subjective.
The quilter gets the score sheet, but there are no individual comments added. So, you know your score, but you have no suggestions for improvement.