A private feed — the deadline of every window you're still pursuing shows up in your calendar as an all-day event, with reminders at 9 AM the day before and the morning it closes. Windows you dismiss or mark completed drop off on their own; no need to redo this.
On iPhone, iPad and Mac, "Add to Calendar" opens a "Subscribe to this calendar?" prompt. On Android and Windows it copies your link instead — paste it into your calendar's "add by link" option (steps below). You can also copy it yourself here:
Where do I paste it?
iPhone: Settings app → Calendar → Accounts → Add Account → Other → Add Subscribed Calendar → paste the link.
Android (Google Calendar): the Google Calendar app itself doesn't support this — open calendar.google.com in a browser (phone or computer both work), then next to "Other calendars" tap + → From URL → paste the link. It'll then show up in the Google Calendar app too.
Outlook / desktop apps: look for "Add calendar" → "Subscribe from web" (or "From Internet") and paste the link there.
Good to know: Google Calendar re-checks subscribed links on its own schedule — a newly saved window can take several hours to appear — and it usually ignores the reminders inside a feed, so set your notifications for this calendar in Google Calendar's settings.