The cheapest version of travel planning leaves no room for costly surprises.
A local event is never just a subpart of destination validation because it can blow up costs and make the experience unviable.
For a budget-conscious traveler, ignoring the holding of a major festival or a sports competition can turn an affordable destination into an inaccessible luxury.
Always check local events well in advance to avoid the accommodation or transportation costs tripling, as during the Rio Carnival, if you are seeking the minimum viable version.