The calendar may not say it’s the summer, but the arrival of the Bob Button Orchestra to Greenwich’s Wednesday Night Concert series is a sure sign it is not far behind. The big band sounds of this longstanding musical group has been entertaining music fans for 40 years. Featuring musicians from across the area, the band plays at gazebos and bandshells throughout the summer. Binney Park, Weskum Wood Road. Wednesday, June 27, 7: 15 to 8: 45 p. m. Free. 203- 622- 7814, 203- 861- 6100, rain postponement number.