How to discover events for event dispatcher I want to write an implementation of EventSubscriberInterface for an event in commerce, there is a handy example, but 


How do I find out what events are available (as a whole for my site) and/or
How do I know what events are getting hit on a request?


This question is not specific to the commerce module, it is just the context of my current problem.
You can simply use the Drupal console.

List all the events that could be debugged:

drupal debug:event

drupal dev

Show the information for the specific event, for example "commerce_order.commerce_order.update":

drupal dev commerce_order.commerce_order.update