Hi mjamero,
I'm checking the site with the Fest theme and installing the gk-nsp and gk-speakers plugins, you can active it now.
In addition, having access to the FTP account would allow me to perform a more thorough analysis of the issue and determine the cause. With the FTP account, I can review the website's code and settings to see if there is a conflict or any other issues that could be causing the problem.
Please let me know if you can provide the FTP account and I will do my best to assist you in resolving the issue with your website.
Best regards