What do you get when you combine the gypsy-jazz stylings of Django Reinhardt and the torchy-twangy mezzo delivery of Patsy Cline with a rowdy troupe of Romani-esque instrumentalists? The answer is the Bonaventure Quartet, an Atlanta-based confederation founded at the turn of the millennium by guitarist/composer Charles Williams. The Bonaventure Quartet will perform at 8 p.m. Saturday, March 8, at The Arts Council Smithgall Arts Center as part of the Evenings of Intimate Jazz series.