Patti Austin, who won best jazz vocal album at this year's Grammys for her CD Avant Gershwin, hosts the Capital Jazz Fest at Merriweather Post Pavilion, which runs tomorrow through Sunday. The roster includes contemporary jazz artist Jonathan Butler, '70s diva Roberta Flack, jazz and R&B; artist Diane Reeves and Grammy nominee Ledisi, who co-wrote and co-produced the music for The Color Purple. Singer Brian McKnight and saxophonist Boney James kick off the weekend. The venue is at 10475 Little Patuxent Parkway, Columbia. Times vary. $36.50-$160. Call 410-547-7328 or go to ticketmaster.com.