I use the host's return address on the envelope.Guests RSVP to the host.I will do reminder calls if I am given phone numbers. So far only ONE person has taken me up on that.My cancellation rate for July was ZERO!!!!! July is usually my hardest month, but when I had guests lists for 6 of my 7 scheduled shows, I knew I no one was going to cancel. Then host #7 almost bailed when she said she couldn't find her address book, but I used some of Tammy Stanley's words on her and now we're still on for next Friday! 