I have only one calendar. I have colour coded my calendar so my work calendar is black, home stuff is purple, and FYI stuff (date related information and tickler items) are light green. I also have a context for deadlines so I can tell if something on my calendar is a deadline or an advisory due date.
The app I use for my calendar does allow me to filter, so if it is getting too busy I can filter for just work stuff/home/FYI.