The Crystal Garden Club hosts Alan Banks for an informative look at the Emerald Necklace at 7 pm, Reading Senior Center, 49 Pleasant Street, Reading.  $5 fee.  Alan Banks, a supervisory park ranger at the National Park Service, says the beauty of the Necklace is that it functions as a series of neighborhood parks as well as a linear park system. “You can actually walk or bike the entire length of it,” he says. “You can see how each park connects the different neighborhoods.”For more information, email Joyce at eyzuvbrwn@aol.com, or call her at 781- 942-0895.