Did you know that you can view your completed activities on the Calendar? It may sound strange but can actually be quite useful.
To turn this on;
1. Right-click within the Calendar and select Activities.
2. From the "Completed Activities" list, simply choose which Activity Types you wish to appear on the Calendar.
3. Ok your way out.
You'll notice that your Calendar is now showing Completed Activities (with a strikethrough font). I find this useful to simply see at-a-glance my completed service from the previous week.