Digital calendars are mini state machines; color is the cheapest debugger you already own. Scheduler Forge students map cron expressions back to calendar blocks so stakeholders see the same story operations sees.
Pick one color for human approvals and another for unattended jobs. When those colors touch, you have discovered a dependency nobody documented. Fix the dependency before tweaking Python.
We also recommend printing one week per quarter. Paper removes the illusion that infinite recurring events are free. If printing feels wasteful, export PDF and annotate digitally, but keep the zoom level honest so hidden overlaps stay visible.