The iconic rifts and cracks in the sky that were formed due to an in-game event back in season 4 seem to be closing up and could be gone by August 21, according to recently data-mined information from the FNBRLeaks Twitter account. The account has been accurate in the past, so there is a good chance there is some validity to these recent claims.
Source: N4G PC It looks like the rifts in Fortnite might finally be closing