HAPPENIN’ OTSEGO for MONDAY, AUGUST 13 Glimmerglass Festival Musicians Perform At Pierstown Grange CONCERT – 7:30 p.m. Annual Florence High Memorial Chamber Music Concert features musicians from Glimmerglass Festival performing works by Beethoven, Brahms, Paganini, more. Free, open to public. Pierstown Grange, 137 Wedderspoon Hollow Road, Cooperstown. 607- 264-3069. LECTURE – 7 p.m. Craig Timberg presents “Russian Disinformation: Will it Happen Again” on threat of Russian interference in future elections, efforts by NSA, social media to prevent future meddling, more.…