I have a need to be able to recreate the 'Save & Send Update' button functionality on the event screen in APex Code, can anyone help with a code snippet on how to do this please.

Basically I want to have an automated process that monthly creates an 'Event' and then sends out a Meeting invite to all the Invitees.  I particularly want the email functionality that has the 'Respond to This Request' button in the email.

Does anyone know what code is run when the 'Save & Send Update' button is pressed?

Thanks in advance.