You have two options for posting your event,
1. Car Show, Rat Rod Show, etc
2. Your Rat Rod Nation Location
In either option, click on "new topic", fill in the subject with your event name. In description, add your event info. Then click post.......
Here's the tricky part, go back to your post and open it. Look down below the post and in the lower menu, you will see "Link to Calendar". Fill in the "Event Title", Fill in the date and year stuff. Now just scroll down and click "save"........done