Ias York could not have fathomed how gigantic the R&B Soul Picnic would become. What started as a nice picnic-style gathering of families listening to soothing soul sounds at the park has mushroomed into a major holiday-type funfest. The R&B Soul Picnic will pop off in Atlanta the weekend of Mother’s Day, May 11-12. Now, organizers in Charlotte, New York, Toronto, London and Paris seek to duplicate York’s creation.