Full Idea
My own broadly Aristotelian view is that events are changes (and unchanges) in the properties and relations of persisting objects.
Gist of Idea
Events are changes or non-changes in properties and relations of persisting objects
Source
E.J. Lowe (The Possibility of Metaphysics [1998], 4.4)
Book Reference
Lowe,E.J.: 'The Possibility of Metaphysics' [OUP 2001], p.97
A Reaction
This needs an account of what it is that persists, and the philosophers' (but not physicists') concept of 'substance' fills this role. It is rather hard to give identity-conditions for an event if it is an 'unchange'. How would you count such events?