Come on guys. You need to be aware that not everyone is following Facebook everyday and that messages sent can be quickly swallowed up and missed. There are potential casters for the next event waiting to hear when it is.
If you want a good following and to increase numbers then maybe its worth letting people know on here of news and what about starting a list of competitors and letting them know updates and date changes on a personal basis in case they miss it from elsewhere.
A data base would quickly grow from the fifteen casters last weekend.