We interact with these companies often.
Their sites also double as race calendars.
There are many others not listed.
Below are some other good race calendars.
There are many others not listed.
SANCTIONING / INSURANCE
Sanctioning is a process of listing your race with USA Track and Field. There is a form to complete, which is essentially an agreement to operate by the USATF rules and standards. While this adds a prestigious credential to your race, the biggest benefit is that it enables you to purchase liability insurance. Many events find themselves in need of a policy, and USATF offers good coverage.
More info: USATF website.
COURSE DATABASE SEARCH
Here's a link to USATF Certified Courses.