Learn how fermented foods help keep you healthy. Make your own sauerkraut at the do-it-yourself fermentation station; buy sourdough bread, kimchi, and kombucha at the makers marketplace; and sample more familiar treats (beer, cider, mead, and wine) in the Ambrosia Garden. Keynote speaker is microbiome researcher Dr. Rob Knight of University of California, San Diego. General admission, $10; Ambrosia Garden, $40.
Leichtag Commons, 800 Ecke Ranch Road, Encinitas. (860) 337-6368; sandiegofermentationfestival.com.