Removing that fixed it! 🙂 The lingering script wasn’t being used on the site as it stands now and removing it made a way for the RSVP success message to properly work. I cannot thank you enough for your response and investigation!
I’m pretty certain the problem is a conflict with our Buddypress plugin because we have used the events manager on other WP sites and have never had this issue come up. However, we need that Buddypress for the site and I have feared deactivating it for losing any settings or info currently on it.
We’re looking at http://wedpros.com/events/2013-best-of-the-best-bridal-show/ for example. Signing up for the event via booking form reveals the error we found in the developer console.
Thank you so much for responding! Any insight is appreciated even if we have to deactivate plugins and risk it. If I temporarily switch the theme, will anything be lost on the one we are using right now?