Well, I'll just tell you what my coach does to me... and you can take it for what it's worth.
For my duathlon back in March, he gave me one rest day, the day before the race. I walked a 5K on that day.
For my sprint tri back in April, he gave me one rest day, the day before the race. Then I worked out for the next 10 days without a rest day.
Those were my C races.
I am hoping that for my A race, he gives me a taper week. Ha!
In the end, it's all about you figuring out what works for you, based on how you feel. And, will a taper week for these races interfer with your training for the Olympic?
"Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather, to skid in broadside thoroughly used-up, totally worn out, and loudly proclaiming: WOW WHAT A RIDE!!!!"