What to do when your organist becomes ill and the concert is in 3 weeks?

Yesterday and today I've been in contact with a producer of the event in our church who organizes an event in 3 weeks with eurythmy and organ music. Eurythmy is a form of movement art, used in Waldorf education system. Here's a video I found online where eurythmy is adapted to Beethoven's Sonata Pathetique for piano:

This organ music was specifically selected for this event. They had their own organist from Poland who suddenly became ill and they are now looking for a substitute organist. I told her about my friend @neugasimov who is a great pianist and improviser and occasionally plays organ too. Their organist had to play pieces by contemporary composers - Gubaidulina, Schnitke, Part and one chorale prelude of J.S. Bach.

@neugasimov looked at the scores and said that since the event is in 3 weeks, the music had to be improvised or not played at all. It is very complex and there is little chance someone will prepare it on such short notice. Therefore, he had to decline.
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Then I, thinking about saving the event, suggested that I could improvise all organ music and the dancers could simply do their part. I told this lady about improvisation event with Vilnius University Kinetic Theater Troupe where we improvised a biblical story about creation of the world:

As I understand even though she liked this video, they are stuck with the specific musical selections that their group of dancers worked on for 5 years. Maybe she will find someone from abroad who would be willing to play them.
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This is one of the most important reasons I like improvisation so much - you can adapt to any scenario, to any situation, to any emergency. But with eurythmy, you are stuck with specific movements derived from specific music.