I'll probably add more events later if this actually takes off.
Forgot Bretons. Not that they'd actually win anything.
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Hmm, can Redguards use Adrenaline Rush? If not, then I vote for Khajiit.
Orcs are good at throwing objects, I believe.
Khajiit are cats, who else can possibly win a jumping competition.
If you want to add more events, do it asap. We can't vote in a new question without deleting all our previous votes - and people won't be bothered to vote over and over again, so they'll just leave it as is.
100M would be redguards.
Shot put would be orcs, because they have the biggest muscles.
Khajiit would win high jump because other than maybe bosmer they are the most agile.
How about a football team (soccer for you yanks)
I'll pick Imperials
I can just imagine as a 'jack of all trades' race the Imperials would be better as footballers.
Nords would be good at rugby, although I could say the same about orcs (and there is no rugby in the olympics!)
Argonians
Nords (hard to decide between them and Orsimer but Nords are probably stronger)
Khajiit
Argonians
Wood Elves would win in 100m because of speed while Redguards take 10,000m due to their stamina.