Kids Birthday Parties in Libraries?

Do public libraries host birthday parties for children as part of their programming? I was with my son at a party for one of his friends a local bouncy inflatables place and happened to be thinking about library stuff while waiting for him to finish bouncing around. Suddenly (for me, at least) the two topics came together. A quick Google search for "library birthday parties" shows one promising hit at the Cambridge Springs Public Library but the rest seemed to be birthday parties for libraries or librarian-themed birthday parties. My son gave a noncommittal shrug when I asked him if he wanted his next party at the local library branch -- that may be why they are not so common, but I wondered if anyone else had heard of libraries doing this.