https://www.gamespot.com/articles/fortnite-challenges-carbideomega-poster-locations-/1100-6459487/

Another batch of challenges are available in Fortnite: Battle Royale. Players who have purchased the Season 4 Battle Pass can complete a set of seven objectives for Week 6, including those that have you searching for a point near a playground, as well as Carbide and Omega posters that you have to spray over. Here's how to complete all of the Week 6 challenges.