Before committing, one must always consider stop conditions that could make a trip impractical.
The idea that local events are a stable component and always present in destination validation is a generalization that ignores the principle of precaution.
Just because an event exists does not mean it is relevant to your goal, and ignoring this can lead to a disadvantageous draw.
If relaxation is your goal, a music festival will not be an advantage, but a costly disturbance, and its impact should be a condition of your choice, not a universal data point.
First, define the objective to avoid bad surprises, like ending up in the middle of the Gentse Feesten when you just wanted to rest.