The first Los Altos Workshop on Software Testing 
was one of Two Takeoff Meetings that I've attended.
Its charter was to "to discuss patterns of success and failure in development of maintainable black box regression test suites." It produced a (longer than I remembered) written document, summarized at the end of "Improving the Maintainability of Automated Test Suites" (Cem Kaner, 1997).
This summary challenged in a public way the conventional Discourse, and mobilized a bunch of people whose reaction was "I Thought I Was the Only One."
The success of that meeting (and document) led to the codification of the context-driven school of software testing .