HAPPENIN’ OTSEGO for SUNDAY, MAY 7 Spring Concerts In Cooperstown & Oneonta CONCERT—4 p.m. Enjoy “Shtetl To Broadway—Music from the Old World to the New,” an evening concert of Klezmer, swing standards and Broadway favorites performed by area artists including clarinetist Robin Seletsky and vocalists Colby Thomas, Andy Puritz and Stan Fox. Presented at Temple Beth El, 83 Chestnut Street, Oneonta. (607) 222-5687 or visit templebetheloneonta.org OPENING CONCERT—4-5:30 p.m. The Summer Music Festival presents “Ying Quartet: American Made” for the opening concert…