A PreRace Blog is a tiny forum component that's attached to each upcoming race.   The idea is that you can post, or look for, messages about that race.   You could ask a question like, "Hey, is it really hilly?" or "I'm thinking of running this, would anyone feel like running together for the first few miles?"

The thing to remember is that the pre race blog is visible only up to the race date.  Once the race passes, all comments are removed.

If you have a story about a race, don't share that in a pre-race blog.   Instead, click the Share a Story link in your user menu so it can be posted to the correct place.