I selected a quantity of tickets and clicked to register/buy them and the checkout page says that there is Nothing in your Event Queue. This happens from my iphone 4s.
This is not actually specific to your mobile device, but due to WP Engine caching the pages on your site.
If I register from here I see the same issue on desktop, the reason it works for yourself is when logged in you will not be served cached content, as I’m not logged into your site I see the cached ‘ticket-checkout’ page which causes this error.
To fix this you need to remove the EE critical pages from caching, on WP Engine you need to create a support ticket for them to exclude those pages.
I can see on your site you have changed some of the critical pages slugs (for example espresso-checkout is ticket-checkout), which is fine, but you’ll need to provide those slugs to WP Engine. If you go to Event Espresso -> General Settings -> Critical Pages (tab) you’ll find a list of critical pages, it is the slugs for those pages you’ll need to send over.
Here’s an example of how this is done when using a Caching Plugin and the default slugs:
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