One of the best flash events in Monopoly GO is Sticker Boom, increasing the number of Stickers you get from a pack. Depending on the Sticker pack, you can earn up to four extra Stickers.

The next Sticker Boom in Monopoly GO is expected on Aug. 21 at 8am CT, based on information found in the game’s files by data miners. You’ll have until Aug. 22 at 7:59am CT to log into the game and activate Sticker Boom for a duration of on hour. Earning extra Stickers goes a long way in Monopoly GO as duplicates are turned into Stars that are exchangeable for free dice rolls.