If you want to  override any event or action in magento then you need to call the exact action and you get the all magento 2 events observer list here.

I have divided all the magento 2 events observer into section like by admin events, customer events observer and sale events observer etc.

You can download all the events into the excel sheet which is very useful to learn magento 2  and implement in your custom magento 2 extension

Magento 2 events observer list for customer – Customer events observer list

Magento 2 events observer list for Admin – Admin events observer list

Magento 2 events observer list for customer – Customer events observer list

Magento 2 events observer list for product- product events observer list

Magento 2 events observer list for customer – Customer events observer list

Magento 2 events observer list for Sales – Sales events observer list