At its meeting Thursday, the Planning Board will hold a public hearing on an application by Redstone American Grill to open a restaurant at 22-24 Third Ave. in Northwest Park, a business park off the Middlesex Turnpike. The restaurant would be part of 3rd Ave., an urban-style retail and restaurant center also including housing that Nordblom Co., which controls the land in the park, plans to develop on part of Third Avenue and surrounding streets. In other business, the board will hold a public hearing on a proposal by Burlington Equitable Unlimited Partnership for a minor engineering change to locate Pure Hockey, a sporting goods store focused on hockey, at 240 Middlesex Turnpike. The store would occupy a vacant space that formerly housed a Star Market. The board will hold a hearing on an application by Burlington Oral Facial Surgery Center LLC for approval of a parking plan it is proposing at 77 Bedford St. Prior to its regular meeting at 7:30 p.m., the board will hold a discussion at 7 p.m. with the Conservation Commission regarding the commission’s proposed revisions to the town’s wetlands bylaw.