Matt Leff is obsessed with craft beer festivals, and he's using his experience producing some of the most popular festivals in Nashville to help build its scene. All day long, he working on logistics, building relationships with brewers, and generating buzz for the next event. And he has a few ideas of how to do it right. This week, he's hosting the 12 South Winter Warmer in Nashville, which makes it the perfect time to talk about how it all comes together.