Theme calendar
Scheduled meaning, not random content.
Local and global themes can become opt-in publishing prompts. Each entity can tick what fits its values, ignore what does not fit, and add its own island-specific themes.
Opt-in prompts
Use the calendar when it helps.
The point is not to make everyone post about everything. It is to help local publishers notice useful timing: seasons, school holidays, safety weeks, public days, arts activity, fundraising and community rhythms.