A public hearing is being held in Bethel tonight about the proposed 10-year plan of Conservation and Development.  The Planning and Zoning Commission is looking for comments from residents tonight on the draft plan.  Planners say the goal is to preserve quality of life in town by managing housing, open space and regulations for commercial development.  The plan was last updated in 2007 and has been under review for about two years.  State statute requires part of the plan address affordable housing.  Tonight's meeting is at 7pm.