Not sure about else where, but here in the NorCal Bay Area, there are two popular Turkey Day rides.
The long standing Appetite Seminar (credits to CK):
And the Los Gatos Turkey Day ride in the South Bay.
Kennedy Turkey Day 2012
I always do the LG ride on a vintage bike (missed it once in the last decade or so). If you're up for putting yourself in calorie debt early on, 8AM start time in front of Summit Bikes in Los Gatos. I'll be on the P-23 Team this year.
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