Much AI governance work involves preparation for a constitutional moment: an opportunity to create long-lasting, decision-shaping, institutions. Doing this well is a formidable task. It requires a fine balance. Institutions must constrain our actions today, yet preserve the freedom to adjust as circumstances change and our wisdom grows. Despite this difficulty, decisions must be made - and in 2020, multiple noteworthy institutions emerged. The research community has an opportunity to inform such decisions.