Has it really been twenty years since ZAP (Zinfandel Advocates and Producers) first held their modest gathering, spearheaded by Ravenswood founder and Sonoma wine icon Joel Peterson (for a glimpse into Joel’s head, check out our interview from Dec. 2008)? Believe it or not, ZAP’s 20th Annual Zinfandel Festival is, indeed, taking place Thursday-Saturday, January…