Question: On what date did the tragedy that resulted in an estimated 80 deaths, and lead to Nicholas Paget-Brown stepping down as leaderof the Kensington and Chelsea London Borough Council occur?
Sentence (from "Hammersmith and Fulham London Borough Council"): The council was created by the London Government Act 1963 as the Hammersmith London Borough Council and replaced two local authorities: Hammersmith Metropolitan Borough Council and Fulham Metropolitan Borough Council.
Relevant evidence: No