The Metropolitan Police wrote to Home Secretary Theresa May asking for the ban two days ago.
We have made this decision based on specific intelligence and information, and our message is clear - we do not want people coming into the areas to attend these events.
The three other boroughs affected are Tower Hamlets, Newham and Islington.
More top news
Two fathers from different parts of London both lost their sons in senseless acts of violence.
TUC research shows that average costs of childcare are outpacing wage growth.
A "weather bomb" is set to bring heavy wind and rain to the UK over the weekend.