There are very few racewalking events in my neck of the woods (the Windsor area of Ontario, Canada). However, I lucked into finding Pegasus Walkers AC just over the border in a suburb of Detroit (http://www.pegasusac.org/Pegasus_Walkers_AC/Home.html). I attended one of their (free!) racewalk clinics last year and found it very helpful and the people friendly and welcoming. A very positive experience! Well, they just posted part of this year's schedule and there are some more clinics coming up in April.
These events are a godsend to people like me who have no local coaches. I'm signed up for the April 7th one, just in time to tweak my technique before my 10K and half marathon!