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Welcome to the Community! I am sorry to hear you lost all events @fayf
Please try troubleshooting: provided you saved your progress with a King account, log out of the game - clear the cache -> not data that will delete your boosters - power off your device for at least 1 minute - restart your device - check for game and device updates- log back into the game. Also make sure you have at least 2GB free memory storage to run the game smoothly and try to connect to a WiFi connection instead of using cellular data. Then play/replay some levels.
Do you play the game via King or Facebook account?
Edit: we reported the issue