You mentioned a possible venue but before you make a commitment can I suggest you take a look at this place?
Ive been there to look at it with ref to organising a poetry course and it is superb, and much cheaper than the Abbey. It is near West Malvern/Ledbury in the midst of fabulous countryside. When you get to the website click the link called "The Lighthouse" - that's the group venue bit. Hil