Okay, if the thought of spending all that time, energy and money to go to a workshop or conference makes you make a face like my dog, there is an alternative. Online workshops. There's even an online conference: The Muse Online Writers Conference.
So, here are my favorites, with a little about each:
Margie Lawson gives a series of excellent online workshops. For example, Defeating Self-Defeating Behaviors teaches the writer how to be more effective, focused and creative.
Coffin of Felony and Intrigue 2008 is the Romance Writers of America's Mystery and Suspense Kiss of Death Chapter's online workshop page. You don't have to be a member of Writers of America to take these superb classes--many of which are more about writing craft than the specifics of mystery and suspense.
And Writer U provides a variety of classes on a wide range of subjects.
All these online classes are inexpensive. No travel. And you can turn in your assignment at 2 a.m. while in your pajamas!