The Troop Tracker is a custom tool to track activity in the garrison. After an event has passed, click the Troop Tracker link in the left hand navigation of the forum. You can then mark off your attendance at the event.
This will show up in a bunch of places, so it is important that you do it!
In your entry in the roster, there is a list of all the events you've been at
When looking at a completed event in the calendar, it lists everyone who was there
The random “featured member” on the roster is like a lottery where each troop counts as a ticket. The more troops you have, the more often you'll show up as the featured trooper!
Record the entry only if you were trooping in a 501st legion approved costume. Members from other groups and wranglers should not check things off in the troop tracker as having trooped.
One thing to be aware of right now is that only PUBLIC events show up in the troop tracker. So, for instance, a garrison cookout doesn't count. There are times that an event is private until it passes. Once the event has passed, the event organizer can go back to the calendar entry and make it public. It will then show up in your troop tracker!