The 22d annual Concerts on the Grass series on the Town Common begins Wednesday with free pony rides from 6 to 7 p.m. and children’s songs by Wayne Potash from 7 to 8:30 p.m. Future sessions will feature the classic-rock group Morse Code on July 11, the Westwood Community Swing Band on July 18, and classic-rockers Three of a Kind on July 25, with children’s activities beginning at 6:15 p.m. and the music at 7 p.m. For details, visit the town’s website, www.bellinghamma.org.