If you haven't done this already, we'd encourage you to submit your race to free online calendars to promote your event. It only takes 10 mins and is FREE, so it's a great way to start spreading the word.
Some of our favorites:
submit asap if you want to be included in the March Race Guide printed issue
http://www.racedirector.ca (Get Out There magazine)
Also, if you have a healthy event budget or sponsorship dollars you may want to consider buying an ad in IMPACT or Get Out There magazine. Check out the advertising guide for IMPACT for their next issue (the Race Guide/Running issue).
We have been at a lot of races and have planned our own for seven years so please feel free to email us if you need help with anything or have questions.