Hartford residents are invited to tour The Mark Twain House & Museum free on Martin Luther King Day, Monday, Jan. 21. (ID is required.) The Mark Twain House is at 351 Farmington Ave. in Hartford. Hours are 9:30 a.m. to 5:30 p.m. (Last tour is at 4:30). Information: 860-247-0998 or www.marktwainhouse.org.