I hear the concern that local events can dictate the choice of a destination, and it is valid to think about complications, but their influence is often overestimated and is not always the decisive factor.
You are not wrong to feel that it can disrupt everything, nevertheless, experience shows that it is not an insurmountable obstacle if we are flexible.
For family vacations, for example, if a major event like the Montreal Jazz Festival makes hotels too expensive, one can simply shift the dates by a few days or find accommodation in a nearby neighborhood.
We manage logistical risks, we do not let the destination be dictated.
Travel is also about adaptation.