A decision will be made later on plans to close four A&E units in north-west London. The units in Charing Cross, Central Middlesex, Hammersmith and Ealing Hospitals could be downgraded to urgent care centres.
That would mean patients requiring accident and emergency care would need to travel to units at Hillingdon, Northwick Park, West Middlesex, the Chelsea and Westminster or St Mary's in Paddington.
NHS North West London claims the move would save money and improve care - however campaign groups say A&E facilities shouldn't be taken away from local communities.
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The 20-year-old was found fatally wounded on Roth Walk, near Finsbury Park, north London at around 3am on Saturday, Scotland Yard said.
Police have arrested a man wanted in connection with a burglary at the home of pensioner Richard Osborn-Brooks.
The rally comes after it emerged that the Home Office destroyed thousands of landing cards documenting the arrival of windrush-era migrants