One Saturday a year, an entire neighborhood's musical history spills out of the rooms and onto the street. The Leimert Park Jazz Festival sets up on the last Saturday in August, on the rooftop parking deck of Baldwin Hills Crenshaw Plaza, and runs from late morning until past sundown. The lineup is the people who play The World Stage all year, plus the visiting masters who come back to Leimert when invited. It is a free-spirited day -- vendors, food, kids on shoulders, elders in lawn chairs, dancers when somebody plays the right thing. The festival has been running since the early 2000s, anchored by the same people who anchor the year-round programming at The World Stage. Saturday August 29, 11:30 in the morning until 8:30 at night. Outdoor -- bring a hat. Leimert Park in late August is one day that nobody who grew up in this part of the city ever forgets.