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After a full-day workshop, you may find yourself deciding what to do with the room. Maybe you reserved it only for the day, and you have to clean it up. More frequently, a Big Picture workshop may be the beginning of something, so it's likely that a few people would be around in the next morning too.
However successful the workshop felt, the workshop isn't over yet. You probably seeded a knowledge bomb in participants' heads, and there's a lot of information that will take time to digest.
Moreover, you may not be sure that you invited all the right people. You might have discovered during the workshop that a key person was missing and that their relevance was greater than initially assumed.
You may want to extend the room reservation for a longer period, leaving the artefact available for additional participants or for afterthoughts the next morning, or move the artefact to a more accessible area.
If this is one of your first workshops, it may be interesting to see who else is attracted to the model. Maybe to discuss it, maybe to challenge it. You may also want to reserve some time for important activities to happen: see Slack day after .
Keeping the artefact visible is also a formidable way to spread information about your journey and maybe find unexpected allies.
In general, the workshop isn't over when it's over. You need to leave time for the findings to settle.
You may also want to stay in the room to capture the model evolution and see who is contributing.
See also Make yourself available as a companion pattern.