If you're looking for rallycross (autocross on dirt) you'll have to look to SCCA.com. They do Road Rallys (Time, Speed, Distance) too. There are some other small sanctioning bodies that do it as well, but that is the main one. Just go on there and find your regional contacts and get in touch with them. If I still lived out there I could probably help you a little more. But I'm up in MN now instead of MD.
Rally-America is only involved in stage rally. Alot of the people that stage rally are into road rally and rallycross, but Rally-America does not sanction those.
BTW, I used to live in Glen Burnie as well. In the townhomes behind Popeye's Chicken on Gov. Ritchie Hwy by Hwy 3 across from Giant Foods.