my six year old son was bullied at a summer boys and girls club camp and camp refused and dismissed concerns.

Its difficult to provide advice based on the information you provided.  When you say boys and girls club, was that the organization that ran the camp?  Or were they hired by the town?  Who did you make aware of your concerns?  Did you put your concerns in writing?  Did you have to take your son out of the camp because of what was going on?  All of these things will govern what you should do.  Are you looking for compensation for your son's pain and suffering?  Or do you want to make sure that other children don't experience the same thing?  Now that the camp is over, you may have a very difficult time finding the people involved.  However, if you have concerns, you should continue to pursue those, in writing, with the organization that runs the camp, hires the people that work there, and provides training for those people since it seems they were not trained on recognizing and preventing bullying.  Good luck.