Beer calendar: Throw down at Grimm Bros., Sanitas, Avery and Sierra Nevada’s Beer Camp
Powder Keg Brewing has opened in Niwot, where it’s the town’s second craft-beer maker; the location has a brewpub license (since it plans to serve food), which means it can also pour beers from other local breweries, including its neighbor, Bootstrap Brewing. Powder Keg plans to be open seven days…