No — a locked door's message and image are never sent to the browser at all, not just hidden on screen. There's nothing to find early even by poking around in the page's own network requests.

It still opens right on schedule, just with nothing behind it — a quiet day is perfectly fine, nothing forces every door to have content.

Yes, any time — come back to this page on the same device/browser and your calendar loads automatically. Changes apply immediately, including to doors people have already opened.

Doors unlock by real calendar date on our server (UTC), not anyone's local clock — so everyone sharing one link sees the same doors unlock at the same time, and nobody can get in early by changing their device's clock.

Yes — "Start a new calendar" lets you begin another one whenever you like. Each one gets its own separate link.