I’m not sure if my method was the best solution, but it worked for what I needed since I needed to record the POST values for a payment system.
Basically, I created a “plugins > events-manager” directory in my theme and copied the “placeholders” and “forms” directory in Events Manager to my theme. So basically my theme has the following directories:
plugins > events-manager > placeholders
plugins > events-manager > forms
I edited the bookingform.php in my theme so that it calls a custom PHP function to deal with the form submission and redirect (I totally bypassed the AJAX script).
Sorry if that’s a bit vague… I kind of just slapped it together to get it up and running.
If there was a simpler method I’d love to hear about it. But I think my method works for what I needed (Events Manager Pro doesn’t support PayPal Payments Advanced at the moment so I needed to write my own payment handler to work with the bookings).