Octavia E. Butler and Writing Workshops

Octavia E. Butler's Wikipedia article mentions that workshops helped her improve her writing significantly. More so than her college curriculum. I tried to find one of the workshops mentioned, it was for minority writers and sponsored by the Screenwriters' Guild of America. The best I could find was this list: http://www.wga.org/content/default.aspx?id=1042. Something of interest to people who may have already started exploring their writing capabilities extensively and want to take it to the next level.