MGM Grand Hotel and Casino, situated on Las Vegas Strip, caught fire, killing 85 people.
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Elon Musk revealed Tesla's first electric cyber truck with shatterproof windows.
Two bombs exploded in pubs in central Birmingham, UK.
Pope Sergius I consecrated Willibrord as bishop of the Frisians at the Church of Santa Cecilia in Trastevere in Rome, Italy.
Benito Mussolini and Leandro Arpinati led squads of fighters in the melee between Fascists and Socialists in Bologna, Italy.
French chemistry and physics teacher Jean-François Pilâtre de Rozier made his first successful balloon flight.