Server Events and the ones archived there are different than Events & Competitions, as they are managed by the server staff and tend to span many days. Events and Competitions thread is for those events managed by players and tend to last as short as an evening.
Since the population will keep on declining inevitably and activity will be more and more focused on regular events, I'd suggest making a new main section like Server Events for Events and Competitions in Discovery HQ to make these as visible as possible.