“Having conducted a number of workshops, both the authors have noted that there is always a participant that is pushing their own agenda regarding something that they would like to attach to your project.  It is worthwhile listening to what they are attempting to attach to your project and quickly make a decision if it is “in” or “out” of the scope of your project.  Making this decision early in the workshop prevents scope creep and the workshop and project from being derailed.  It also leads to another model the authors have found in workshops called “Pushing their own wheelbarrow” - here is that article.