Social and group events now offer Add to calendar in their related links, exactly as walks do: Google, Outlook, or a download for the device's own calendar app, with the choices depending on what the device can open.
Open any social or group event and look in its related links.
The site's calendar feed of walks and events used to include deleted and draft walks, which went out to anyone subscribed as confirmed events titled "Deleted walk" followed by an id. They are now left out.