We did that for one of my BFFs. Me, her other BFF, and her then-boyfriend planned it together. It worked good because she would be at soccer before the party.
Yeah right. The girls she carpooled with invited themselves over to her party, and they told her they were doing so. They weren't invited. They didn't bring a card or anything either.
It bothered me and other BFF so much we sat as far away from those girls as possible because we were ready to rip their eyeballs out.