Did the Brownbacks lot not give you any idea of what they wanted from the blog?
I would hazard a guess at:
1. Ooh, the race series is about to begin. We've got support from ... (Hope etc etc), the race categories are..., here's some pics from last year..., Why not give it a go?
2. Our team has been up to the quarry to plan out this years races. Here's some pics to give you an idea of what to expect.
3. The first race took place today. Here's a bit about what went on and a link to the results.
4. The second race took place today. Results and pics if poss. Description of the course and how you went on as a competitor.
And so on for all 4 races. Try to have a chat with other racers on the day and glean some content from them: Who crashed, who got yet another puncture, did any crazy horsewomen appear on the course, who forgot the prizes for the singlespeeders - that sort of thing.
If you get stuck for ideas/content just give me a shout and I'll try to help out.