My son discouraged us from attending his A School graduation, but we attended both Power & Prototype ceremonies. Power was pretty substantial, while Prototype was smaller & more intimate.
Each school does have a graduation - we made it to A school & prototype (NY) but everyone says if you can only pick one to pick power school - it's a bigger ceremony. We enjoyed both the ceremonies we went to. (And I'm not sure if there is always a prototype grad.)
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We went to all three. A School was somewhat formal, Power School was more formal and ceremonial, Prototype was informal.
Check out this discussion:
http://www.navydads.com/group/nukes/forum/topics/a-school-graduatio...