If you are not signed in to WordPress (i.e., you’re not an admin), then you can’t register. After adding to cart, the page says, “It looks like you are attempting to refresh a page after completing your registration or your cart is empty. Please go to the events page and try again.”
This is an issue unique to running WordPress on WPEngine because they have some fairly aggressive caching going on. If you contact WPEngine support and let them know that you need the following pages set to no cache:
The support post ‘Registration only works when signed in to WordPress’ is closed to new replies.
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Support forum for Event Espresso 3 and Event Espresso 4.