Probably the main distinction for a triathlete is the distance. These triathlons in Toronto cover the Olympic distance, Sprint distance, Give-it-a-Tri distance; as well as a Duathlon and relay over some of these distances.
My "The Usual Pair of Toronto Triathlon Competitions in 2013" covers as many details as triathletes need in my recent DeHaan Services article.
As always, my Xanga blog ("They're Back: the Twin Toronto Triathlon Events in 2013") also publicizes my article.
One Competitive Writing Tip
Don't be afraid to a topic that you've covered before.
Last year it took me about three articles to cover these triathlons. "To Untangle Two Toronto Triathlons in 2012" has my eventual explanation about the different organizations. (That hadn't been clear to me when I first learned Toronto hosts triathlons at all).
During 2012, especially the first half, these triathlon articles were quite popular.
This year, all I really needed to do was to find the registration pages for these triathlons and explain which organization supports which distances.
The writing tip is to revisit topics if appopriate.
Many "Toronto Events" will recur annually, so there's a ready supply of material. Holidays and seasonal topics have the same pattern.
Perhaps less predictable are health concerns or other topics that pop up from time to time.
Once you develop an expertise for a topic, consider adding new articles from time to time as the need and interest resume.