Hint #1: there are a lot of girl's names in the grid... surely you've heard of some of them to know what media franchise they belong to...
Hint #2: 15-Across and 37-Across don't count
Hint #3:
50-Down is the latest one (at time of this puzzle's publication)... find the one that's missing... don't be afraid to use Google or ask your kids/grandkids for help
Hint #4: 4-Across hints at how to arrange the 13 princesses
Hint #5: consider the first letters of the relevant clues