Cancelled events should not be the default redirect target for city.wordcamp.org

[ciudadanoB]

Summary

This issue comes from a discussion in the #meta-wordcamp Slack channel (props to Ohia for raising it 🙌).

When a WordCamp event is cancelled, for any reason, visiting the main city URL currently redirects to the cancelled event's site. This doesn't provide a great experience for visitors, as they land on a page for an event that never took place.

Example: Visiting https://granada.wordcamp.org currently leads to a 2025 event that was cancelled, instead of redirecting to the last successfully held edition: https://granada.wordcamp.org/2024/

Expected behavior

• The automatic redirect from city.wordcamp.org should skip cancelled events and point to the most recent completed (or upcoming active) edition instead.
• The "See the next edition" messaging should also not link to a cancelled event.

Notes

• This doesn't require deleting the cancelled event's site, it should still be accessible via its direct URL (e.g., granada.wordcamp.org/2025/). The change would only affect the default redirect logic and the "next edition" message link.
• Grace period consideration: It might make sense to keep the cancelled event visible as the default redirect for a reasonable period of time after cancellation. People who knew an event was being planned might be confused if it just "disappears" without notice. A time-based grace period (e.g., 30 days? 90 days?) before the redirect switches back to the last completed event could be worth considering. Open to input on what makes sense here.
• SEO note: Jono Alderson also suggested in the Slack thread that past/cancelled events should be set to noindex to avoid outdated content appearing in search results. This may warrant a separate issue or could be addressed together, thoughts welcome.