Below are most of the details from the Upland post but essentially there are competitive hunts going on all weekend through Monday that started today and you earn entries or point towards drawings for the block explorers below.
If you place in the top 200 players by the end of the competition too then you can get the gold stock car racer BE which will only have 200 mints were the blue and the red have 500 and 1,500 so a better chance at getting those.