This is KT-speak for "Look where I was and you weren't.
I have been to more (real) wrap parties than I care to remember, I can tell you that there is usual a company you hire to handle the party so the whole cast and crew can attend.
When you are on a lowbrow piece of crap that most people were over years ago, I guess you have to put on the party yourself.
Unless this was something other than a wrap party, which I wouldn't know because I have never done zombies.
They are just not my thing.