They do one every saturday and although I already know the basics, it's very important to know how they enter the Zendo, do kinhin, and other small pieces of protocol. I also got an introduction or clarification of the soto way to sit.
The big bonus, however, was a lecture by Barry Magit - the author of one of the recommended books at this sangha ('Ending the Pursuit of Happiness'). The only reason I didn't buy the book right there is that the crowd was pretty big. I figure I can amazon it with 'Mind of Clover'.