Share 'Are any other sets of regional movements coming together in statewide events/organizations?'

Here in Ohio we have 2 strong local collaboratives and a few that are starting out. We are beginning work on some statewide events, work, etc. Does anyone have experience with this? We are wondering about structure (a statewide 501c3 with local chapters? or a looser dynamic?) and other issues. We are also planning a big statewide event.