A proposed zoning bylaw regulating the location of medical marijuana dispensaries is to come before the fall Town Meeting that convenes Oct. 29. The Planning Board, which has been developing the proposal, will hold a public hearing on the measure, most likely at its Oct. 17 meeting. The 2012 state ballot law that legalized medical marijuana in Massachusetts allows the state Department of Public Health to license up to 35 nonprofit dispensaries — at least one but no more than five in each county. The proposed bylaw would specify the areas in Raynham where a medical marijuana dispensary could locate, and minimum distances to such facilities as schools, churches, child care centers, parks, and municipal buildings, according to John Charbonneau, the town’s director of planning and development. He noted that a moratorium Raynham previously adopted on medical marijuana dispensaries is set to expire in November.