Johanna's birthday! IYKYK (March 10th). No flip flops.
Yes. They may not get access to the bouncy castle, but they are welcome. No flip flops.
Pack a lunch and leave us alone. (But you can tell us though; there will be a wide variety of food options and we'll make sure you're accommodated). No flip flops.
No, we're not rich. No flip flops.