How much space is available for the visit? Should there be more or less?
Are there objects or locations that need protection? How can you keep them safe during the experience?
Does the experience change based on available staff or volunteers? When might this happen, and what will the consequences be?
Do children provide personal information? If so, have you ensured that an appropriate adult has helped them to provide informed consent? Do children interact with others? If so, this should happen under the supervision of an appropriate adult
How will you control visitor contributions? Do you need to and, if yes, do you have the resource?
If the experience becomes very popular can the venue, staff and technology handle an increasing audience? When will capacity become a problem? Are limiting mechanisms needed? Can you scale down if popularity is sporadic?