[Mick]

Was everyone at the event over 21?  Tend to doubt it. 
Given Stanford's never ending bad publicity related to an intoxicated former varsity athlete, I am willing to give the University and the AD a pass here.  If the club team doesn't have a single person under 21 on the team, then it might be a bit harsh.  My guess would be the logic for the action was not a new policy, but rather rules/laws related to alcohol at organized events with under age attendees.

Agreed.  I think it's perfectly fine for coaches and coaching staff to be fired if there is alcohol at team parties as long as all coaches are (a) notified of that in advance and (b) that all coaches who have ever had alcohol at team parties are also fired.

[Mick]

Was everyone at the event over 21?  Tend to doubt it. 
Given Stanford's never ending bad publicity related to an intoxicated former varsity athlete, I am willing to give the University and the AD a pass here.  If the club team doesn't have a single person under 21 on the team, then it might be a bit harsh.  My guess would be the logic for the action was not a new policy, but rather rules/laws related to alcohol at organized events with under age attendees.

Agreed.  I think it's perfectly fine for coaches and coaching staff to be fired if there is alcohol at team parties as long as all coaches are (a) notified of that in advance and (b) that all coaches who have ever had alcohol at team parties are also fired.