What does it take to establish and maintain an evaluation community of practice? This session at #eval14, the 2014 AEA conference, had two purposes: 1. Present a historical example: Celebrating 30 Years of the Washington Evaluators 2. Exploring the question together via a think tank: How can evaluation communities of practice take advantage of opportunities and address challenges to sustain evaluators and the evaluation profession? #AEALocalAffiliatesCollaborative #WashingtonEvaluators