Hi,
Thanks for using the Events Calendar.
Here on the pre-sales forum, I’m afraid we do not provide technical support. I would ask that you take any technical support questions across to our wordpress.org forum – our staff scan it periodically and other community members may also be able to help out.
The Events Calendar
Having said that we do not put “Register For This Event” buttons with our plugin and that is most likely in your theme and they might be able to help you out better there.
Thanks again!