I think most of the Stitt / Pepper tension was generated by Art.
I witnessed a session when Stitt joined Von Freeman at Ratso's in Chicago, around 1980, and Von "ate Sonny's lunch".
Not unlike my feelings about Dunlop. Might be a Chicago thing.
I suppose it is too much to hope for discovery of the first few takes from the Monk's Music date when Wilbur Campbell filled in for the tardy Art Blakey.
No, this was a one off. The Chicago Jazz Festival started in 1979 and in 1982 we had a quartet of Freddie, McCoy Tyner, Ron Carter and Tony Williams. This was broadcast and the recording gets around.
Hazy memory says raised stage near near the center, seats of the field, "box seats" in the first couple of rows of the stadium.
Monk cancelled and Blakey was the sub.