Going out to eat after college graduation, and my mom only wants family there... but I also want a few friends?

[Have_Faith]

I'm graduating college in May, and my mom said she's just going to treat me, five family members, and my friend and his mom (who claims me as her daughter), out to eat. I already had my huge party when I graduated high school. That's fine by me, for the most part.

Except the more I think about it, have five other good friends (one who has a boyfriend and child), plus three high school students I've known for years, and had many opprotunities to mentor them. If we're having a little celebration, then I really want these other people to have the chance to join. I told my mom I'd at least like to send them a facebook message, I'd explain that my mom is only paying for family, but if anyone else feels like dropping into eat with us, they can (and I don't think that's rude). But that's an extra ten people, and the thought just seems to stress my mom out.