It’s World Singing Day, and you can participate in a community-wide sing-along on the Boulder County Court House plaza today, Saturday, October 24 for a sing-along led by six local chorales from 11:30 a.m. to 1:30 p.m. On the program are 28 well-known songs from the pop repertoire. Presented by the international nonprofit World Singing Day, which was founded in Boulder in 2012, and supported by the Boulder County Arts Alliance, this FREE, public event is about connecting the Boulder community and celebrating our common humanity. 1300 Block of Pearl St., Boulder.