The Calendar Event module does not have the capability to send donation or registration notifications. 

However, we do recommend posting a suggestion in our Idea Bank, as we are always looking for ways to improve our products. 

Workaround: Admins can set up an Event Attendees Report in Report Writer and schedule it to run on a recurring basis to show the most updated registration results: https://www.blackbaud.com/support/howto/coveo/luminate-online/subsystems/reports/concepts/admin_events_reportwriter_eventattendeereport.html