I am hoping that two out of those four do not participate in senior night activities for the obvious reasons. I know it is not conclusive, as with Dorka, who did senior night twice and probably didn't know at the time whether she was coming back or not, but if say Paige and or Aubrey have decided to return, not participating on the 16th would be a statement to that effect.
On the other hand if they do participate I wouldn't be surprised if a chant broke out in the crowd that was something like "one more year".
In any event these celebrations are always special and a great tradition.