This looks to be a combination of the WP theme using a different jQuery library (one from the jQuery CDN) and trying to load the page (and thus the jQuery library) as https. code.jquery.com does not support SSL. Please see this:
Yes it is something that we could fix via a support token, though theme updates may over write our changes so you may still wish to contact the theme developer in respect to this.
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Support forum for Event Espresso 3 and Event Espresso 4.