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Full Idea
There is a temporal argument for the possibility of non-identical indiscernibles, if there could be a cyclical universe, in which each event was preceded and followed by infinitely many other events qualitatively indiscernible from itself.
Gist of Idea
If the universe was cyclical, totally indiscernible events might occur from time to time
Source
Robert Merrihew Adams (Primitive Thisness and Primitive Identity [1979], 3)
Book Ref
'Metaphysics - An Anthology', ed/tr. Sosa,E. /Kim,J. [Blackwell 1999], p.176
A Reaction
The argument is a parallel to Max Black's indiscernible spheres in space. Adams offers the reply that time might be tightly 'curved', so that the repetition was indeed the same event again.