EventMobi provides all kinds of useful analytics before your event even begins, both pertaining to your event app and your registration site.
You can find useful information about the usage leading up to your event in the Analytics Report tab under General Settings in your Content Manager. Here, you can see behavioural data collected from users who have logged in and are doing things on the app, along with data collected by Google Analytics about general activity on various pages and on the app in general.
We currently track when registrants have completed their registration and when they are checked-in by you. We also use Google Analytics to give you insight into the general activity on your registration site through page views for particular pages and the site in general.