@sozobe,
Yes there are lots of Senior only type things...this is senior week and their last day is today. During the week there is all sorts of events and things for the seniors.
On the last day -Upon driving into the school today - the seniors all line up in the entrance and squirt cars, scream and wave at everyone - they have matching T-shirts in school colors. Then they march in go to auditorium, get yearbooks and later on the entire school of underclassmen line up and the seniors all march out and say good bye to everyone - then there is a cookout and they leave whenever they want after that.
I know we are already thinking of my daughter's graduation - as we have lots of relatives out of state and many plan on coming, we will likely have a party the day after seeing we should have so many family members visiting- they typically graduate the second Friday after the last day of school. We have 4 graduates next year all within a stone's throw of our house. We had thoughts of combining a big party, but not sure if all 4 neighbors would be in on it. Many neighbors do consider doing this.
To complicate matters - the senior are done with school but softball is still going on this week and since we made tournament play already we will be playing after graduation. I remember last year our one senior on our team actually came to practice the Friday of her graduation. She did leave early though.