Except for a concert performance that the composer himself staged in 1911,Scott Joplin's ragtime opera"Treemonisha"was not produced until 1972,sixty-one years after its completion.
Except for a concert performance that the composer himself staged
Except for a concert performance with the composer himself staging it
Besides a concert performance being staged by the composer himself
Excepting a concert performance that the composer himself staged
With the exception of a concert performance with the staging done by the composer himself
B
"Ongoing", as used here, means "ongoing in the timeframe of whatever is described/modified".
If you were thinking "ongoing into the present", then, no.
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