6th Birthday

Well, my son is turning six in 4 days and to celebrate we are having a birthday party with 10 of his friends at Colorado Journey Miniature Golf. We initially invited 6 kids but as of this evening we have 12. 2 were totally unexpected. They aren't siblings either. A mom called asking my husband if her son could bring 2 friends to the party. He didn't know what to say so he said he could. We don't even know the kids. Our son doesn't either! Who does that?? All I can say is I hope we survive!