A life, laid out one dot per week. The grid doesn't end sharply — it dissolves, and the blank space past that is deliberate: no one knows exactly where their own line stops.
Stored only in this browser (localStorage) — nothing is sent anywhere.
A one-time event at a given age — retirement, a move, whatever marks a turn. Shades the weeks between now and then.
A repeated event — how often you see someone, do something, go somewhere. Marks every future occurrence on the grid.