Another smaller one in Berkeley, CA almost eleven years ago:
Berkeley balcony collapse
On June 16, 2015, shortly after midnight, five Irish J-1 visa students and one Irish-American died and seven others were injured when a balcony on which they were standing collapsed. The group was celebrating a 21st birthday party in Berkeley, California. The balcony was on the 5th floor of an eight-year-old apartment building at 2020 Kittredge Street in Berkeley, then called Library Gardens.
The laws of physics are always obeyed. As soon as these structures are built the gravity is always pulling them downward. Add human activity such as stomping and rhythmic dancing and there is an additional destabilizing force. Its a wonder there are not more horrendous collapses. A few years back the Golden Gate Bridge featured a celebration where close to two hundred thousand people were all walking on it. Later engineers stated the bridge was not designed for that type of stress and fortunately it did not fall.