Upcoming events list would leak unpublished events

PublicationDate filter is not working propertly, and the unpublished event would still be displayed on the http://127.0.0.1:3000/events?type=upcoming page.

<img width="1197" height="411" alt="Image" src="https://github.com/user-attachments/assets/b7fd25d9-d95c-402e-b36f-aae1c6e15b8e" />