One of our favorite post rockers Grimace Federation will be opening for Toubab Krewe, a group of learned musicians that mesh West African traditional music and American rock. While I find Grimace Federation leaning more towards their darker metal influences these days, their former reputation as an afro-beat/acid-jazz outfit still precedes them. However, I think that their upcoming new album that is due out this fall might have people thinking differently. Their recordings online really don’t do them justice anymore, but don’t worry stoned jamband folks – Grimace Federation are musical chameleons so you might get a sampling of those tasty grooves that you are so hungry for. Just get there early to check them out live and find out what they are really all about! World Café Live (Downstairs), 3025 Walnut St., 9pm, $17 floor/$22 mezzanine, All Ages – Q.D. Tran