Yeah it must have been Spectre. Kirk wouldn't really have time to go that sort of gathering in the other novels except for the Captain trilogy and the first one in that series started on Bajor with Picard.^ Spectre, I think it was (in Montreal, wasn't it?). Been a while since I've read that one.
I enjoyed Spectre. It was one of the early Trek novels I read after having really enjoyed The Return. I loved how it involved elements of DS9 and VGR as well TNG and Kirk. Sadly I think the quality of the Shatner books started to go downhill after it.