Yeah, what khandu said!

The Irish bar in Jackson is spelt Fenian's. When you hit town pick up the Planet Weekly for current music listings. There is now a little blues museum in the Farish Street area (adjacent to downtown), I'll see if I can dredge up a phone number for ya. If you need a place to just walk in and start asking questions, report to Hal & Mal's downtown, a bar/restaurant open from lunch on thru the night which also hosts a truckload of music.

The route you're looking at is fine but I like staying on 61 myself all the way from I-20 north, goes through the rural delta more. Once your route gets into Greenwood, you're actually up & out of the Delta. Maybe you could make a loop where you catch both routes.