This profile mentions -
http://pollstar.com/blogs/news/archive/ ... 67482.aspx
Following a May 24 appearance at the Sonoma Jazz Festival in California, the singer will hit the road for a limited run in support of Sugarcane, with one leg kicking off June 9 at the Beacon Theater in Red Bank, N.J., and the second August 15 at the Deer Valley Music Festival in Salt Lake City.
There's no mention, however, of such an appearance on the festival's site -
http://www.sonomajazz.org/p-sonoma-jazz ... al-18.html