Use the mobile-app configuration to enable only the sections the event actually needs. Common sections include Agenda, Networking, exhibitor maps, gamification, files, FAQs, custom pages and self check-in.
Keep labels consistent between the navigation menu and the page title so attendees do not have to interpret two names for the same feature. Put high-frequency onsite tools near the top of the navigation and hide unfinished or unused modules.
Preview the app on a phone-sized screen after every major navigation change.