How do I edit the name and colour of a calendar?

From OurCal's Settings tab:

1. Tap Calendars
2. Tap theℹ️ Info icon next to the calendar whose name you'd like to edit
3. Tap the name or colour of your calendar
4. Edit it's name or colour and tap Done

Please note that the name will apply to all Group members with the calendar, while the colour will be user dependent.