July 17, 1981. Anniversary of the collapse of aerial walkways at the Hyatt Regency Hotel at Kansas City, MO. About 1,500 people were attending the popular weekly tea dance when, at about 7 PM, two concrete and steel skywalks that were suspended from the ceiling of the hotels atriumbroke loose and fell on guests in the crowded lobby, killing 114 people. In 1986 a state board revoked the licenses of two engineers convicted of gross negligence for their part in designing the hotel.
July 17, 2017 all-day