You have the option to notify the registrants of your upcoming event by using either Individual Notification or Advanced Notifications. To do so, navigate to the Team Workspace and select Instructor-Led Training -> Notify Members in the navigation bar on the left
Find the event and offering, which will lead you to the Notify Users screen. Here you have the option to notify specific individuals (Individual Notification) or you can select a group of employees based on their job and location (Advanced Notification).
Note: You can only notify users for upcoming events.
Please note that in the case of Advanced Notification you have the option to select if you want to notify all of the registrants or just the Pending Registrants.
After the user selection, add a message and an attachment (if needed) and hit Notify.