Charge and set up any headsets, radios, and walkie-talkies you plan to be using during the event. These are essential to communicate with other staff members if you have a large event.
Create multiple copies of your contact information including your staff, volunteers, vendors/catering, artists, speakers and yourself. Make sure these are either posted at different staff stations or shared on a Google Doc.
Along with giving everyone the master schedule; include any Wi-Fi passwords, terminal logins, and access codes that might be needed.