From what I understand (don't quote me on this though... it was a while ago), in the past a GLO at my school did something that resulted in a punishment of social probation and community service. The next year when a new pledge class was recruited, they were exempt from the community service but were still on social probation with the rest of the chapter... doesn't seem fair that they didn't even go to the school at the time the incident occurred, nor did they have any knowledge of it.
I understand that a chapter advisor would think those who "did nothing" are just as much at fault... but hopefully there are measures taken to avoid this even happening in the first place. For example, my chapter has "bus babies" as part of risk management that watch the busses that take us to and from events. One woman watches the busses at the house, and another at the place of the event. If women are visibly drunk they are not allowed on the bus to the party or into the party... and we double check to make sure alcohol is not brought onto the busses. In addition, all members were given the numbers of our risk management chair and our president in case of emergencies.
I don't think this incident is anyone's fault but the women who made poor decisions by drinking so much, but I am wondering about City Museum as well. Why is there a cash bar open when there are children present? Why were children present in the first place? I'm sure the City Museum felt that the event would go off without incident, as it seems many similar events have in the past... but the one difference is the alcohol. I understand that City Museum can do nothing about women who came to the event drunk, but they also weren't helping the situation by serving alcohol...