C.W.
I am totally with you on the phone thing. One of my daughter's friends calls her repeatedly, like the same night, after 8, and she is in bed around 730-8. We tell her every time but she still will do it. One girl in kindergarten told me I should wake my daughter up to talk to her. My daughter isn't eager to call her friends, but I would set the rule no calling after 7, unless that parent had given us a green light, but we are usually getting ready for bed at that time, so they wouldn't be calling that late anyway.
I have no idea about the rsvps. I have found that for parties, unless an adult emails or calls, the kid isn't coming, even though many times they say that they are. Same thing for invites, the kid may invite her over, but they often don't know that their parent has other plans. I always ask that the parent email or call me to confirm. My daughter is 8. We just moved to a new community with a lot more kids in the neighborhood, so it will be interesting to see if things are different with play dates around here.