Yes, you can update content at any time even after your app has been submitted or published.
You can add or remove features (for example, adding or deleting features like "Speakers", "Schedule", "Maps") and change the content within each feature.
Content updates are free, unlimited and applied to your app instantly - no need to update via App Store or Google Play. The only content that has to be finalized before submitting your app is included in the App Store section on Settings step (the App Name, Icon, Icon Label, Description and Splash Screens).
These items are hard-coded into your app and we would need to resubmit your app to the App Store & Google Play to update them - due to the manual work involved on our end, it costs $199 and the updates take up to 1 week to be approved by the App Store.