You mentioned nothing of substance here -- just your statement that you feel that you're better than a whole lot of people.
Besides -- who wouldn't Jesus invite to a party? And besides --- Jesus liked his wine as well. He said if the invited guests can't enjoy themselves for all that I prepared for them --- go out into the streets and find anyone you can get to come to the party.
I suppose in your vision - only perfect people should have the right to have a good time.
People are people and people want to have a good time.
It's an event that people look forward to every year...and their school depends on those revenues. I imagine it's the same crowd of people that has been coming since the 1980's....and now probably their grandchildren.