This is not the way to get these people back, no offense. But they are not here in the first place, they won't see this thread. The best way to catch somone you miss is either PM or email them. I've done it many times and it works.
I remember Thelma saying that she is very busy with her work and doesn't have time to hang here that much. She posted here last time when it was her birthday.

I can answer in the behalve of my friend 4 Feline house that she won't be coming back. Why? Well, because she doesn't want to and that's her right, end of story.