By Finding the Secret Battle Star in Week 7 and Finishing the Blockbuster Loading Screen Challenge, you also unlock the Visitor Outfit.
Before you can grab the new Blockbuster Outfit and the Secret Battle Star in Week 7, all 7 weekly challenge sheets have to be completed first.
Once all of them are completed the Visitor Loading Screen and the new Outfit unlocks. Finally you can pick up the Free Battle Star from week 7 at the center of Dusty Divot at the top of the broken meteor.
All Week 7 Challenges
Deal damage with a pickaxe to opponents (250)
Search Chests in Risky Reels (7)
Consume Hop Rocks, Apples, or Mushrooms (20)
Score a goal on different pitches (5)
Follow the treasure map found in Pleasant Park (1)
Assault Rifle Eliminations (5)
Eliminate opponents in Shifty Shafts (3)
Season 4 Challenges
Fortnite | 14 HUNGRY GNOME Locations (Week 8 Challenge Guide / All Hungry Gnomes Season 4)