HAPPENIN’ OTSEGO for SATURDAY, SEPTEMBER 4 Commemorative 10K Races HEROES RUN – 9 a.m. Come Commemorate 20 years since 9/11 with local firefighters, Assemblymen Salka and Oberacker, and others. An a capella group will be singing ‘God Bess America’ and there will be a flag raising ceremony ahead of the run. Will feature a 5K and 10K run starting at 10 a.m. Cost, $20 for the 10K. Proceeds will go to the Stephen Siller Tunnel to Towers Foundation. Begins and…