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You'll probably find that there are at least one or two photographers dedicated to these areas, possibly through being hired by the organising bodies themselves.
If you can source photo's via the organising bodies, it'll also put you in a situation where they become familiar with what you do (if they don't already), which, of course, is always useful.
It may well afford you the opportunity to develop working relationships with the photographers themselves. They, I'm certain, would welcome any new outlets for their work.
They should then tell you what you need to do in order to get the images you want.
At the same time, ask to be added to their press/media mailing lists so that you get advance notice of any and all future news and events stories.
Hope that helps.