All ages Friday, June 26, 7 p.m.: Line dancing with Lady T in the Reichert Family Barn at Southold Historical Museum, 55200 Main Road. Open to all, no experience needed. Admission: $20; $10 for museum members. Limited space; pre-registration recommended: southoldhistorical.org, 631-765-5500. Saturday, June 27, 9:15 p.m.: Orient Harbor Independence Day Fireworks at Orient Harbor.....