How can a team protect creative attention during a busy workday?
A speaker on the creative panel described when she personally finds room to think. That's her routine, and it doesn't mean anyone else should work at night. If you want protected thinking time for a team, build it into the work plan.
Ask the team which interruptions make a particular creative task difficult. Then choose a bounded period inside the work plan where the group can focus, with a clear route for anything urgent.
Define what the time is for. It might support examining a brief, developing an argument or working through alternatives. I'd keep it from becoming another meeting full of status updates. Where the task permits, let people use the space their own way: some need quiet individual work before a discussion, and others do better with a short exchange followed by time alone.
Then review whether the arrangement helps the work and whether it shifts burdens onto colleagues. Protecting attention is an organizational choice. Employees shouldn't be asked to solve the schedule by donating hours when everyone else is offline.