The Community Calendar publishes events, meetings and fundraisers in The Jamestown Sun at no charge. Thursday, July 30ADVERTISEMENTBuffalo City Group AA, 7:30 p.m. (open, speaker meeting), United Presbyterian Church, 302 2nd Ave. "Mary Poppins Jr.," a musical, 3 p.m., The Arts Center, 115 2nd St. SW. Tickets: The Arts Center or Eventbrite. Jamestown City Council and Jamestown Parks and Recreation Commission, 4 p.m., City Hall, 102 3rd Ave. ADVERTISEMENT"Mary Poppins Jr.," a musical, 3 and 6 p.m., The Arts Center, 115 2nd St. SW. Tickets: $12 adults, $10 children, available at The Arts Center or Eventbrite.