Niwot Jazz Festival and other Boulder events on Saturday

Niwot Jazz Festival: 3 p.m., Cottonwood Square, 7960 Niwot Road, Niwot. The Niwot Jazz Festival returns with the Soul-Stice Party and a star-studded lineup, including Amelie Quartet, Mercy, Mercy, Mercy, Robert Johnson and Quemando Salsa Band. Free, 720-412-1548, niwotjazz.org.