Flyers and posters Central Park flyers Changeable flyers - fill in your own location, day and time. Central Park 8.5" x 11" poster Changeable 8.5" x 11" poster - fill in your own location, day and time. Other materials for organizers: Complete instructions Organizer checklist Sign-in sheet for volunteers Have You Hosted an Event? Let us know how it went with this post-event report form.