The event will be held at the Volcanic Theatre Pub from 5 to 6:30 P.M. T uesday. Admission at the door is $20 for chamber members and $25 for non members.
Flaherty was elected D.A. in 2010 when he defeated long time D.A. Mike Dugan.
John Hummel used to be a Bend City Councilor and practiced criminal law in Deschutes County for ten years.
"He's qualified and I'm qualified. We both have different qualifications. We each have different strengths and weaknesses and what's important is going in front of voters and letting them decide."
The moderators for the debate are the Bend Chamber's Jamie Christman, the Source's Aaron Switzer and KBND's Kelly Bleyer.