How to find out who created an event?
CiviCRM DOES store that information, but doesn't expose it to the user interface.  So you have two choices:


Check with SQL.  This will give a list of all events with creators:


select ce.id, ce.title, cc.display_name from civicrm_event ce JOIN civicrm_contact cc on ce.created_id = cc.id;


Add WHERE ce.id = x before the semicolon at the end to just show a single event (where x is the event's ID).


I wrote an extension that allows you to view (and change) the name from the user interface called Edit Event Manager.