Agree on what would count as a useful result
Before a creative session, name the problem and the intended audience. Decide what the group should leave with: several alternatives, a draft, a prototype, or a decision about the next experiment. A lively meeting and a long idea list may be enjoyable, but neither alone shows that the collaboration answered the question it was organized to address.
Choose a small number of criteria appropriate to the project. For a community notice, clarity and accessibility may matter. For a prototype, the central question may be whether someone can complete a particular task. Record the criteria before reviewing the proposals so that the most polished presentation does not quietly redefine what success means.
Review the work and the process separately
Examine a sample of the output with people who were not immersed in making it. Ask them to attempt the intended task or explain what they understand. Record the difficulty they encounter and the assumptions it challenges. Distinguish an observation from a preference, and avoid treating a few encouraging comments as proof that the design works for every audience.
Also review whose ideas reached the discussion and how choices were made. Were contributions credited? Could quieter participants influence the result? Did the collaboration leave clear ownership of the next step? If a digital or immersive tool was involved, identify the specific work it enabled and the friction it added. Keep, revise, or drop that tool according to its contribution to the project, rather than the novelty of the meeting experience.