There was a lot of dancing - both demos and people joining in! In the first photo Dance Unlimited demonstrates ZUMBA on Church St. They were great. http://www.danceunlimitedfrederick.com/ While in the crowd I spoke to Jen from http://www.jenrtraining.com/ and she said they have Zumba classes in Walkersville as well.
I couldn't figure out who was doing the dancing on the creek, but the crowd jumped in enthusiastically. Let me know if you know, so I can give them credit.
The last photo was a demonstration from Korean Martial Arts. See www.koreanmartialartsinc.com