Workflow for New Event Registration
To my Knowledge this is not a straightforward thing - but can be done - 

You need to create an extension and use post or postprocess hook 

whenever an Event is been saved against database you need to trigger an action to send an email



Install Civix 

Extension creation:
https://wiki.civicrm.org/confluence/display/CRMDOC/Create+a+Module+Extension

Hook reference:
https://wiki.civicrm.org/confluence/display/CRMDOC/Hook+Reference

I guess this helps!!!