V.T.
You were right. The hostess and the guest of honor are all you need. A general wave would be okay but not necessary. It reminds me of when I hosted a baby shower for a friend of mine. I actually walked people out the door and they still didn't say goodbye to me or even thank you. I was taken back that women in their 30s behaved this way. I shouldn't of been. Throughout the whole party they acted like a bunch of high schoolers.