We're sandwiched in between Economist Magazine's infamous 2015 cover's possible 11.3 and 11.5 dates.
List of "onthisday.com" events Nov 3rd thru 5th of that year.
The very last one resembles the "lawn jarts in polished concrete" theme.?:
11/5/2015 Fundão dam in Brazil collapses, killing about 23, causing a second dam to fail, releasing a massive flood of mud down the Rio Dulce
Reminded me of a 5/5/2015 event.