Can you be forced to attend a baccalaureate service?

I've never even heard of a baccalaureate service before, because "baccalaureate" has always signified a bachelor's degree to me, so I had to look it up. I can't imagine why a public high school would have such a thing. Assuming that you're telling the truth, and it's in the U.S., you should contact the ACLU. I just don't exactly believe you.