Question: Is there are "Review Form" once you submit all the information on an event registration? It will give each registrant the ability to check for any errors before submitting the final registration.
There is no way to "review a form" before submission. The only work around would be to make the form a single page so they could look at the entire form before submitting. Also, with a paid account you can send respondents an email receipt that includes all of their data. They can use that to double check their responses and if there is an issue they could email you so you can fix it.
Hope that helps.