Invite your parents.
For reasons I have no desire to post about, I don’t get along with several members of my family. But I generally invite them all to major events, because if I snub one, it puts the others in an awkward position.
Speaking as a parent, graduation ceremonies are a major snooze. If you want to do them a favor, don’t invite them.
The first one of my cousins to get married and his gf at the time invited their parents and siblings to lunch without telling them that it involved a prior stop at the civil registry for a bit of signing and filing; they sent post-facto notifications to everybody else. Then my brother got engaged to a woman with a huge family and of course my mother couldn’t have less guests, so she claimed that as my brother was #2 we had the duty to invite all those people who hadn’t been invited to #1.
I decided that if I ever got married, I’d go the #1 route.