I checked your site and this is some information that the W3 Total cache plugin is printing in the footer of the html:
This means that database and object caching are turned on. You’ll need to disable those in order for Event Espresso 4’s registration process to work.
The support post ‘When clicking 'register now' I get the mesage "Nothing in your Event Queue"’ is closed to new replies.
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Support forum for Event Espresso 3 and Event Espresso 4.