Tickets are $8 and must be purchased in advance. Contact Kathy Bresnahan or Rita LaBella at 978-374-2390 for tickets. Discussion on arthritis planned: Dr. Benjamin Schwartz will be at the Citizens Center, 10 Welcome St., on June 23 at 10 a.m. Schwartz will answer questions about arthritis of the hip and knee, non-surgical and surgical alternatives, and Mako Robotic Arm-Assisted Surgery. Refreshments and giveaways will be provided. Register by calling Mary Connelly at 978-374-2390, ext. 15, or emailing her at email@example.com . Ancient form of exercise: Tai chi helps reduce stress and anxiety.