Organize a dog wash! A local dog rescue group did that recently, and it was a huge success. They contacted a nearby pet supply store and got permission to set up their dog washing operation in a designated section of the parking lot. The store did the advertising about the dog wash, since it was to their benefit to have all those dog owners/potential customers show up. The dog wash was held on a Saturday morning, and the place was packed! It was a win-win situation for everybody. I went there, and it was pretty fun.