If you plan a good program but nobody knows about it, you are setting yourself up for disappointment. Publicity can include posters, flyers, banners, diag boards, bus signs, newspaper display ads, direct mailings, public service announcements, etc. See Publicizing your Event and Organization for additional information. Determine the program's details. Make a list of what needs to be done before, during, and after the event.
Sample details are equipment needs, registration tables, special power hookups, etc.
Even the smallest details should be written down on a checklist.