With respect to all parties, the notion that the impact of local events would be a universally present component in destination validation seems like a hasty generalization.
I would reserve my judgment until the main decision criteria are clearly established for each travel context.
This is not always the case; for example, when a company organizes a seminar in France, the availability of infrastructure and the total cost often take precedence over the local cultural agenda.
An important football match in Lyon will not affect the decision if the goal is to find an affordable and well-served conference center.