“DAZZLING DAHLIAS,” July 31 at 6 p.m., Trafalgar Library, 424 S. Tower Drive. Free and open to the public. Peggy Bryan will talk about the colorful world of dahlias and how best to grow them.

From Barrel & Flow to TacoMania to VegFest, August is shaping up to be one of the liveliest months for marquee Pittsburgh events.