Every two weeks, there is a season event in Clockmaker. The event icon is located in the bottom left-hand corner of the screen.
To progress in the event and get rewards for event stages, you need to collect special gold tokens that drop when you win levels. As soon as you collect enough tokens for a reward, you can claim it on the event screen.
Please note that initially only rewards on the left side are available to you. To obtain the additional special rewards on the right side, you need to purchase a Gold Pass. The pass unlocks access to the special rewards on the right side and also increases your base number of lives to 10. Please note, the pass is only valid until the event ends. The Gold Pass is unique for each season event, and it stops working as the event ends in the game.