Richard Kallos will present A Nanopass Framework for Compiler Education (http://www.cs.indiana.edu/~dyb/pubs/nano-jfp.pdf), touching also on A Nanopass Compiler for Commercial Compiler Development (http://andykeep.com/pubs/np-preprint.pdf), with reference to the recently open sourced Chez Scheme (https://github.com/cisco/ChezScheme).
I'm excited about this presentation because we will actually spend some time in the guts of Chez Scheme, which is a high-quality production compiler.
Aside from the compiler aspects, I think there's also an interesting software engineering case study here, as this describes a drastic refactoring of a large commercial software product.
Lovers of Lisp and those curious about compiler implementation should certainly attend.
Please note that since AdGear is moving offices soon, the venue is slightly uncertain. I will make an announcement if the venue changes.