Here are several possibilities:
* Artists in different locations improvise with each other, in an open ended way.
* Come up with musical configurations. For instance, a Musician A in Location A improvises with Musician A in Location B, then MA in LA improvises with MB in LB.
* A schematic can be drawn up so a clearly defined set of sequences can help the performers develop their performances around mutually understood sets of guidelines / scaffolding.
* * *
If you'd like to suggest more performance configurations be included, please mention those in a comment and I could add those to this list.