@Behappy1st I had the same thing, at least I got my diploma in the mail. But my sim invited a few of her friends bought food from the table and same thing nothing. No one showed up. So this sounds like a serious bug because I have only MC Command Center for a mod. @sireneiles if you graduate early, I don't think you have a ceremony to attend. Don't quote me on that. This is a legacy game that I started with my founder doing rags to riches.
I thought if we get a conversation going like this and more invloved if they have issues there might be an answer to our problem. Maybe it is not a bug.