This article explains how to collect club bonuses and why they may require diamonds.
Where to collect club bonuses
Club bonuses — including Club Event rewards, Season rewards, Jackpot Bonuses, and Purchase bonuses — must be collected from the Club Wall. To see your available bonuses, make sure the Bonuses checkbox is enabled on your Club Wall view.
Bonuses expire
Club bonuses have expiration dates. If you do not collect a bonus before it expires, it is permanently lost and cannot be recovered. Check your Club Wall regularly to make sure you collect all available bonuses in time.