How to preview event on the app before publishing:-
1) Download app from app store or play store.
a. App store: https://itunes.apple.com/us/app/hostevent/id1345358570?mt=8
b. Play store: https://play.google.com/store/apps/details?id=com.quickezapps.eventapp
2) Sign-in to app using same login/password used to create event on web admin.
3) Look for the upload type of icon on top left corner
4) Once you click on the icon you will be able to see your event.
5) Click on the event to see the details.
6) As you update the event info and add features on the web admin side, you will be able to see updates on app for preview.