Calendar subscription - iCal format

it would be good if I could get a published calendar in ical format for all my future (and possibly past months) bookings. I should be able to generate a personal calendar url that has a security token that identifies me (and possibly includes options of what I want included for each event).

By subscribing to that calendar my bookings would appear in my calendar on my smartphone, tablet and pc.

For each event the location could be filled in with the site address making it easy to navigate to. As well as having site contact details, arrival/departure times etc all readily available.