I did a dep job on Eb bass for a brass band once, it was a beer night where they had to keep playing without breaks between pieces. Each part had a number on it and the MD hand-signalled the number of the next piece while you were playing the current one. You then had to find a sequence of a few bars rest to get the next part out of your pad. Or in the case of the basses, one player at a time, since there are virtually never any bars rest in the bass parts for the kind of pieces you play at a beer night.
You would think that it would be better to just sort the order out before the start, but the MD wanted the flexibility to go with the flow and select an appropriate piece in real-time.