This document outlines the agenda for a summer institute focusing on sustainability challenges for 1:1 Early College High Schools. The goals are for teams to identify key audiences and messages to engage their community in supporting the unique 1:1 program, and to share effective strategies. Teams will work to develop a sustainability plan and draft methods to document outreach efforts. Activities include reviewing school data, guidance from experts, work time, and sharing sessions to connect teams and gather resources for planning community engagement and advocacy.