You know and love Sandor Katz from that funky pink and green book, “Wild Fermentation.” His new, in-depth fermentation guide, “The Art of Fermentation,” builds on his obsession with all things bacteria. He’ll be at The Brooklyn Kitchen on July 31 to talk about microorganisms, evolution, culture and community, and to sign books.  Attendees will get a copy of the book. Very limited spots, so reserve your space soon!