ACT Writer's Centre workshops
However, should you be thinking of getting in line for a stand-by ticket, there will be 2 hours of worldbuilding, 2 hours of plot talk, 2 hours of characterisation, and 2 hours of talking, thinking and working on language and voice (yes, you'll be made to swear and sing).
Go here for details. (It's the Short Story Intensive workshop.)
Which reminds me, must go off now and devise more fiendishly difficult and embarrassing things for my students to do. Heh-heh.