If you were given a two-hour time block for professional development on a Friday afternoon just before the school district is to go on a week-long vacation, what kind of professional learning would you offer to maintain adult learners’ interest and meet their learning needs? Your audience includes 175 K-12 teachers and administrators from a school district in Maine, and your topic is assessment literacy. How would you make the best of a challenging situation? We chose an interactive immersion gallery walk to present information about foundational classroom assessment literacy concepts and skills. A gallery walk is a discussion technique that gets learners out of their seats and invites them to become active participants in the learning process. We added new strategies to engage small