I've booked a party for DS birthday in a couple of weeks. It's costing almost £20 per child. All the parents have responded to say their kids are coming except 1. I don't know this parent at all. So can't chase them up for a response. I need to pay the balance next week. Would you pay for the child who's parent hasn't responded? What if they turn up and their place hasn't been booked? The party is not at a play centre - it's at a activity place so have to prebook for the group and preorder the food they've chosen. But also, I could add a different child on if this kid isn't coming. But don't what to pay for another - then this kid who hasn't responded turn up! Would you always respond to kids party invites with a yes or no ?