Full Idea
The standard cases of events are physical changes which happen sufficiently fast to be observed as changes, and which are of sufficient interest to us to be noticed or commented on.
Gist of Idea
Events are fast changes which are of interest to us
Source
D.J. O'Connor (The Correspondence Theory of Truth [1975], Ch.7)
Book Reference
O'Connor,D.J.: 'The Correspondence Theory of Truth' [Hutchinson 1975], p.62
A Reaction
It is obviously right to include this relative ingredient in our concept of events. Geologists might treat very very slow happenings as events. We all acknowledge events which are of no interest.