The San Francisco Photoshop Users Group will be meeting at Adobe SF Thursday evening starting at 6:30:

With the advent of Lightroom 4 a new Develop Module has been introduced with completely renamed sliders. Fine art photographer William Palank hopes to clarify some of these changes and propose a workflow completely different than in Lightroom 3 or its predecessors, bringing forth even more control with Shadows and Highlights on a single image.

Check out the event page for more details.