First off, what rides are you doing in August. I would be interested in doing an organized ride in August.
I'm also hoping to do the metric at the Harmon and the full century at the North Shore. Time will tell if I have the stamina and if my knee holds out (love using that excuse

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Labor day weekend is a no go for me as it looks like I will be out of town with the family. Late September sounds good though. I'm already concerned about doing my first and second century rides on back to back weekends.
Must spend more time on bike, must spend more time on bike...