Okay, here's one possible venue-Cork Public Museum. They have a gallery upstairs with rotating exhibits... I've seen a quilt show there, also Ellis Island photos. Not sure how early they book out, but I've met the curator, Stella a few times and I know she's always interested in new ideas.
Here's what they had this year, You can see the layout of the room. Suitable? Just gonna add, click on the last link on that page and you'll see the photo exhibit that's currently up
Cath.