Advocate for modules and easy repurposing
It may not be part of the brief, but you can bet repurposing is a future requirement. Build in modules from the start to give as much autonomy to the board owner as possible.

Larger room names and sequence numbers
Embarrassingly basic, but not everyone browses at the zoom level I designed for. You should be able to understand content from all levels.

Use chat GPT to aid brainstorming
Fast track ideation and validate from audience perspectives using AI (in combination with own contributions)

Use Midjourney to create furniture
Now that I've established proficiency in Midjourney prompting, I would create specific imagery in a cohesive style without cost or license limitations.

Less is more
I've now worked on enough large projects to know that that our appetite is often bigger than our bellies when it comes to the number of visual areas requested in the original brief.

My future approach to a project requesting 24 exercise areas would be that we either create a quality wireframe prototype to test with real participants before the design phase, or to design ~12 areas and gather feedback before creating more.

In this instance, a purposefully modular approach from the outset would have been beneficial, and accommodated the need for any change of order, and creating different environments for shorter versus longer workshop durations.