A fellow trike builder was organizing a float with his church, to participate in the Santa Claus parade in Wasaga Beach, ON in 2003.  He asked (or we bugged him - don't remember which :)) if we wanted to ride in the parade too, and a bunch of us said yes.  We dressed up both in quasi-theme, and also to make sure we stayed relatively warm, and away we went.

There were about a dozen trikes and trikers that showed up, all homebuilt.  We all had little bags/buckets of candy that we gave out as we zig-zagged back and forth along the parade route for about 6 km.  The weather was a little cool, but the light exercise from riding was more than enough to keep us comfortable and warm.
A fellow triker/builder on my Mk 4 trike, tossing some candies at the crowd/camera.
Me on my Mk 3 trike pulling our 6 year old daughter in our Little Tykes trailer.  She was dressed up as Mary, and I gave her a big bucket of candy to distribute to the kids in the crowd.  It allowed me to concentrate on driving, and it gave her something to do.  She had a great time.
Some of our kids up at the front of our little trike group.
We had a lot of positive comments, and lots of smiles.  It was a good time.  The plan was to do it again the next year, but everyone was too busy on the day of the parade, unfortunately.  Always more parades and next year :)