No owner, no thesis. The assertion that local events are always a major component of destination validation lacks the governance necessary to be universally applied.
Who is responsible for deciding when this impact is relevant, and for what type of trip?
Without a clear RACI or escalation process, it becomes a shaky generalization.
For a business trip focused on a specific meeting, the impact of local events is often negligible, unless they block access to the destination, which requires an approval on acceptable risks.