What went wrong at Astroworld? Expert: It took 'everything going wrong, like dominoes'

Corrections & Clarifications: An earlier version of this story listed an incorrect name for Edwin Galea. 

As details emerge about the deadly events at Travis Scott’s Astroworld Festival, the question looms: How does a tragedy like this happen at a concert?

This was the third edition of Scott’s curated music event in his Houston hometown, so the blueprint was already created. The outdoor, two-day event sold 100,000 tickets for a lineup that included Lil Baby, SZA, Tame Impala and Roddy Ricch (Saturday's concert was canceled). 

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