Hello @destro7g9o and welcome to the forums!
Sorry to hear you are experiencing issues with the world event in the game. The bug you are referring to should already be fixed in one of the updates of the game, so make sure you're fully updated and try again!
If you still cannot complete the event after updating the game, let us know on what platform you are currently playing and record a short video showing this issue for further investigation, please. You can upload it to one of the streaming sites and provide us with a link. Thanks!
If you have any further questions, or require further assistance, let us know!