The demonstrations mark nine years since Mark Duggan was shot dead by Met Police officers, sparking the 2011 London riots.
Dorothy Woolmer suffered severe injuries to her head and groin area during the attack in Tottenham.
The boy – believed to be 18-months-old – was pronounced dead in hospital on Thursday.
It is believed the victim was stabbed whilst another teenager was being robbed of his Nike trainers.
A 15-year-old boy and 21-year-old man are both in a critical condition following yesterday's incidents
Reece Dempster, of no fixed address, will appear at the Old Bailey on Friday.
Police say the 89-year-old had been assaulted.
The former MP is still a host on Talk Radio despite previously breaking impartiality rules.
The fire raged through the night, with firefighters called to the unit just after midnight on Thursday.
Another teenager received multiple stab wounds in the south east of the capital.