An example of the benefits of attending the stone symposium is the presentations on Japanese stonework I was privileged to attend. One of the presenters was Sadafumi Uchiyama, curator of the Portland Japanese Garden: http://japanesegarden.com.
He gave two presentations on stonework in Japanese gardens, one specifically about the various types of pavements, sidewalks, etc.. with specific and detailed guidelines for why and how japanese gardeners approach these projects. This presentation was particularly useful in helping me connect with a recent client in East Asheville who is building a Japanese garden around her home, and wanted a sidewalk based on photo of a sidewalk in a Tokyo garden.