The event has only ended for those that started on Thursday when it first opened. The auto start was 4 days later. A player has 10 days to finish the storybook. When you do the upgrade to finish each chapter, the drops stop for the rest of that day. When you do the final upgrade in an event, usually all drops and crafts for that part of the event disappear. Side quests like the ram will continue until the very last day.