Kariem Abdelhalim died at the scene after being found seriously injured in North Kensington.
Some 20,000 unwanted coats will be collected, distributed and gifted to those in need.
Keiron Charles, 17, died in East Acton on Saturday afternoon, the Metropolitan Police said.
A boy is arrested after Keiron Charles was stabbed to death in what police call an "awful incident".
The collie, belonging to Rory Cellan-Jones, was one of six dogs taken when a van was stolen.
William Fernandez was being held on remand at HMP Wormwood Scrubs ahead of his trial.
