The Planning Board will meet at 7 p.m. Wednesday at City Hall. Agenda items include public hearings postponed from May, including a request to put a Dunkin’ Donuts with a drive-through window at 155-163 Beach St. and a request to allow a convenience store at 841 Eastern Ave. New hearings on the agenda include a request to reconstruct a commercial building at 7 Cross St. and a request to renovate the third floor of a triple-decker at 109 Boylston St.