What event file should be kept in chronological order?

The correct choice is that past tournaments should be kept in chronological order because it allows for a clear and organized historical record of events that have already taken place. This organization facilitates easy reference to the results, statistics, and any notable occurrences from previous tournaments. It is essential for maintaining an accurate historical archive that can be used for analysis, reporting, or for informing future event planning.

By keeping past tournaments in chronological order, staff and organizers can track trends over time, such as performance statistics of players, changes in participant numbers, and other factors relevant to the development of the tournament. This information is valuable for improving future events and for understanding the evolution of the tournament's landscape.

In contrast, the other choices reflect different needs for organization. Future events may be arranged based on their scheduled dates, but they are not historical and thus don't benefit from chronological order in the same way. Sponsor agreements and player registrations involve different criteria for organization, such as by priority or status, rather than chronological order.