Skip the cathedral: of course, local events can impact planning, but it is rarely the most important consideration for an average traveler.
More often, factors like weather or transport availability are aspects with lower energy costs for decision-making.
Changing an entire travel plan for an event, unless it is the primary goal, can be a waste of energy.
In the Netherlands, for example, unpredictable weather can disturb a trip much more than a festival, making the lightest plan often the best.