I now have Lollipop on my phone, I wish I hadn't as it seems to have messed with the way I set my phone up. I am using the calendar for mine and my children's appointments, so some events were set up as busy and some as available. During the busy events my phone would be silenced, during the available events my phone wouldn't be silenced.
I might be wrong but I seem to be unable to do this and now all the events put the phone into silence. I do not want have my phone silenced when my children are at Tae Kwondo, but I want to be able to use the calendar to keep track of their busy social lives.