This is the kind of thing that the Trailblazers chapters are really good at. Combined with an already-planned rally, it could be a great success. It was the Trailblazers' New England Pilgrim Chapter that got together and hosted a Screen Door Day when I first developed the TM screen door.
Using the club organization would save the need for individuals to try to organize something from scratch.
http://tmtrailblazers.org/
Bill