The game stores the event rewards and progress in an accountDataDB.package file. By modifying that file you can trick the game into thinking you've unlocked the rewards or completed quests. This tool has two uses:
Click on the "Choose file" button below, navigate to Documents > Electronic Arts > The Sims 4*, and select the UserSetting.ini file. It may be displayed as just UserSetting. Your browser will prompt you to download an accountDataDB.package file. Put that file in the same folder as the UserSetting.ini file.
Die Sims 4, Les Sims 4, Los Sims 4, etc.
1.109.207 because they were initially stored in a local file only, not synced with EA servers, and many people have lost the rewards because of it