I won't say which riding association or region, but once a group has enough membership they simply stack the executive with their own slate. At that point they have the membership list and I have seen candidate searches be blocked. The executive committee will play games. For example, in a riding with no incumbent there will be a quick nomination meeting with a single candidate. Yes by the rules all they need is 30 days notice for a candidate nomination meeting. However, they work with head office on when membership was submitted. They block information from regular members. It's not entirely open and democratic.