Hey Peggy Sue,
Congratulations on your upcoming gig. I cannot think of a more worthy cause. First of all, as to your question about the poster - I think it is great. Preston's comment about the logistics of the event are valid though.
As to the name of the organization - well, that is really a secondary issue for me as you are working for them. I don't mind it personally as it definitely gets the point across. However, I bet that the very name really does potentially stop/deter adoptions though...and I wonder how many of the kittens/cats they are adopting are really feral and not just strays.
Having a truly feral cat in my home (I have had two), I can tell you that it is a whole different bowl of wax from a stray off of the street who has had human interaction. I love my feral (Jackie) a lot. She runs a tight ship at home , LOL, particularly since the boys have been gone. However, it was years and years to get her to the point where she has been comfortable accepting attention - and actually seeking it out.
Keep up the good fight.
James