Selectmen have scheduled disciplinary hearings on Monday and on Nov. 20 to address allegations that six bars served alcohol to an underage customer during a compliance check by town police. Establishments in question allegedly served a 19-year-old whose identification clearly showed when the person would turn 21, officials said. The businesses in question are Showcase Live at 23 Patriot Place; CBS Scene Restaurant at 200 Patriot Place; Bar Louie Tavern & Grill at 232 Patriot Place; Blue Fin Lounge at 1 Bass Pro Drive in Patriot Place; Waxy O’Connor’s at 121 Main St.; and Foxboro Mandarin at 369 Central St., in Foxfield Plaza.