Firstly, join an event and then go and reach your target distance or elevation. Do this in your own time, anywhere in the world, using a GPS computer or app (E.g. Wahoo, Garmin, Strava or Fitbit)
Once you've completed your ride, simply upload in to Strava. Your activity data will automatically sync to the event and you'll appear on the leaderboard.
If the event target has been reached, you will receive your reward in the post. Wear it, stick it, carry it, however it - with glory.