Great point Josh! We've only used the app for events that we had the list of registered attendees. The app does have the ability to create new leads though. For our purposes, we had a list of fields (outside of basic information) we wanted to capture at the event.
Whitney, if you have some specific fields other than (name, title, email, company and phone number) then you will want to use the form you have set up. If you are only collecting email, name and phone OR if you will have questionable internet access then you should absolutely try out the iPad Event App. You will have to do a little setup, but it is worth it!
Here is a link to the App info in the community: https://community.marketo.com/MarketoArticle?id=kA050000000L5iiCAC
Here is a link to the App on itunes.com: https://itunes.apple.com/us/app/marketo-events/id522766637?mt=8