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Scala is reputed to be a good base for designing a Domain Specific Language (DSL).
Perhaps we could use the August 2013 session for designing one -- and use Behavior Driven Development "Given When Then" frames to make the DSL language spec self documenting.
For example, suppose we want to compare the members of a collection in a side-by-side table. (I just picked this because it seems do-able in a single session.)