Has Eric Holder(attourney general) ever spoke at a high school graduation before?

We were just told this morning that at our high school graduation the US Attourney General Eric Holder would be our guest speaker. We were pretty ecstatic considering it's the first guest speaker we've had then we realized this man's a pretty big deal, haha. I was wondering because we're a pretty small school, from a town in the middle of nowhere who only has the superintendent speak each year and now we have the AG coming with the CIA and everything. I won't mention the school's name for obvious security reasons but how rare of an occurance is this and has he ever done it for a high school before. I've seen he's spoke at a few college graduations but that's all I can find.