In the forth week of Fortnite Battle Royale Season 7 there is an hidden Banner, to unlock this Banner you must complete all the challenges of this week successfully.
Have you made all the challenges? If not, here is an overview of all challenges in week 4.
Where is the hidden Banner in week 4?
If you have completed all challenges you will get a new task in the “Snowfall Challenges“, Find the Secret Banner in Loading Screen #4.
At the tower you can see that it leads us to Happy Hamlet, in the video you can see the exact location.