A Couple of Clicks Away
There are a number of excellent running clubs around the world that are easy to find, inexpensive to join, and that sponsor activities you can participate in on either a particular weekend or all year.
Belonging to a running club is a good way to stay motivated, learn from others, meet people with similar interests, and participate in challenging events. Some clubs are big — like those associated with well-known marathons such as the Boston Athletic Club and the New York Road Runners' Club. Sparsely populated areas have smaller clubs. Different clubs have different personalities.
Search via Yahoo! and Google for “running club + [the name of your town, state initials]” (for example, “running club + Kimberton, PA”). You're bound to find a lot of interesting sites, even if they aren't what you were originally looking for.