On your iPad or iPhone:
1. Go to "Settings"
2. Select "Mail, Contacts, Calendars"
3. "Add Account", select "Other"
4. "Add Subscribed Calendar"
5. Paste in iCal link (see them just down the page), no password required (it's optional)
All Parents
All parents would add the All Academy calendar for events that cover the entire school.
This calendar link is for events covering All of the Academy:
Primary Parents
A Primary parent would add a second Primary School calendar for a complete picture.
This calendar link is for events covering the Primary School exclusively:
http://www.google.com/calendar/ical/isfpta.org_a6h3vcu691vsfg6odel505gork%40group.calendar.google.com/public/basic.ics
Middle School Parent
A Middle School parent would add a second and third calendars; Secondary School, and Middle School for a complete picture.
This calendar link is for events covering All of the Secondary School:
https://calendar.google.com/calendar/ical/isfpta.org_0rrh3red4n274vs21f255agtl4%40group.calendar.google.com/public/basic.ics
This calendar link is for events covering the Middle School exclusively:
https://calendar.google.com/calendar/ical/isfpta.org_fu96ao6bvhfn8bgetbg5g0f6qc%40group.calendar.google.com/public/basic.ics
Senior School Parent
A Senior School parent would add a second and third calendars; Secondary School, and Senior School for a complete picture.
This calendar link is for events covering All of the Secondary School:
https://calendar.google.com/calendar/ical/isfpta.org_0rrh3red4n274vs21f255agtl4%40group.calendar.google.com/public/basic.ics
This calendar link is for events covering the Senior School exclusively:
https://calendar.google.com/calendar/ical/isfpta.org_8fjn4jjecnfb7o2pb1gb506rb0%40group.calendar.google.com/public/basic.ics
PTA Events
This calendar link is for PTA events:
Once you add the calendar you have the option of whether or not to display it. You may wish to not display the calendars at times to minimize clutter.
One last thing, on MacOS devices it is under File > New Calendar Subscription