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The Napa to Sonoma Wine Country Half Marathon is returning for its 20th anniversary this weekend. Over the years, the Half Marathon and Rosé 5k weekend has grown into one of the top races in the country. The Sonoma City Council has presented a proclamation in honor of the 20th anniversary of the race. The festival weekend is a big one for the county. There are more than 5,000 registered participants this year who have signed up for the Half Marathon or 5k.