How can my associates receive an email when they get a new registration for an event

You can send an email to the submitter following this guide: https://www.jotform.com/help/26-Setting-up-an-Autoresponder-Email 

You may also send the email notifications from new submissions to more than one recipient, this guide will help you adding multiple recipients: https://www.jotform.com/help/39-Send-Notifications-to-Multiple-Recipients 

I hope this helps.