Split between two groups of friends!?

There are two groups of people within the big group I'm friends with. They're all kind of friends but theyve formed subgroups. First is Crystal, jess, lara, naomi, and lisbeth. Theyre okay, but VERY clicquey. the second group is natasha, ariana, lisbeth, and me (lisbeth is kind of in both). Recently though, the first group people hang out with me more. It's annoying because I want to throw a party at the end of 9th grade (this year) and I don't know who to invite. If I invite both goups they'll all be mad!