The weak link in this analysis is to believe that the impact of local events is universally a major factor for all trips.
For many, the purpose of the trip dictates the importance of events, not the other way around.
A business trip to Brussels will hardly be disrupted by a beer festival, because the proximity of the meeting place and a stable internet connection are priorities.
The hierarchy of priorities is not stable; it depends heavily on why we travel, which is often a flaw mode in overall planning.