Struggles with Brevity

I'm preparing for the PaLA Conference in October. My boss submitted a poster session proposal for the outreach program, and it was selected to participate. I am creating a tri-fold poster that explains the program and spotlights patrons in action. I took some wonderful pictures of the seniors perusing the collection and checking out materials. Now I need to arrange the text and the photos on the poster board so that the overall presentation is clean, concise, and aesthetically pleasing. Doing that may not seem difficult, but it is when the assembler is wordy and detail-obsessed! How can I possibly encompass this wonderful, beneficial program in a synopsis and a few bulleted points? Rambling, hyper-detailed descriptions are my specialty, but they won't serve well in this project. I plan to triumph over the temptation to besiege the reader with a plethora of prose. Game on!!