It seemed that the least I could do was to share this with my readers, who might otherwise be as confused as I was when I first found the references.
As always, I also publicize my article in my Xanga blog ("Two Toronto Triathlons in 2012").
Follow up on previous news items.
Pay special attention to your popular articles, since people are still reading them.
Also follow up if you had written about a topic ahead of time. I had only expected to be able to add a few words to my older article, and only if the organizers had released any new information. My specific goal was to pass along "where to register for the race", since I had not learned that back in October.
Here is an example of a different opportunity to follow up. Suppose you had written about "flu shots" early in the season. You could follow up with "vaccination rates went up/down or held steady", as well as "health officials report more/fewer/similar# of cases of influenza".
You're creative about your topics. Be creative in finding ways to keep your readers informed about the aftermath.
To use a sports metaphor: don't just swing, follow through.