Next year’s Super Bowl and men’s World Cup matches planned at Levi’s Stadium will draw such huge crowds to the Bay Area that the region’s leaders are hoping to draft the enthusiasm and tourist dollars they bring by planning festivities of their own — from concerts to block parties and drone shows.

As much as those events are intended to make for ebullient, rolling street parties, local leaders are preparing for something sinister as well: a worst-case scenario.

Santa Clara County’s O’Connor Hospital, for instance, just ran a drill with doctors, nurses and volunteers in its back parking lot. The hypothetical disaster? A bomb exploding with poison chemicals at Levi’s Stadium.

“With major sporting events coming next year, we’re really emphasizing more mass casualty training, decontaminatio

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