That would be fantastic. I imagine a fun format where you are presented with the bug, and given some appropriate, but short, length of time to try and diagnose it. (Let's say, 15 minutes to an hour.) Then, the presenter polls everyone to see if anyone figured it out, and explains the actual bug and the fix in an actual presentation.
All talks about bugs, how they were solved, dead ends attempted, tools/techniques used to diagnose, etc.
Would be really useful to see how other people approach debugging and you'd probably get to learn about lots of tools you didn't know existed.