Sadiq Khan on Wednesday announced a ticket-only “fan zone” would be set up in the square to allow spectators to gather to watch England’s three group games, plus the two semi-finals and the final.
Wembley is hosting all of the matches and Mr Khan hopes the Euros – delayed for a year by the pandemic – will help bring visitors back to London.
Due to social distancing rules, only 750 people will be allowed into the fan zone to watch England’s first two matches, against Croatia on June 13 and Scotland on June 18.
All tickets for these matches will be given exclusively to key workers such as NHS medics, nurses and paramedics, police and Transport for London workers, as a “mark of gratitude” from the mayor for their efforts during the pandemic.
But if Covid restrictions are further relaxed, as expected on June 21, up to 9,500 fans could then be admitted – including to the England v Czech Republic match on June 22. Key workers would receive a proportion of tickets for this match.
Tickets will be distributed via a free ballot, with details to be announced in due course.
Alcohol cannot be brought into the fan zone but Heineken beer will be on sale. A zero tolerance “one strike and you’re out” policy towards racism and other forms of discrimination will be enforced.
Plans that were in place prior to the delay of the Euros last year for Greenwich Park to host the fan zone have been ditched.
Mr Khan, who launched a Let’s Do London campaign this week to encourage domestic visitors to the capital, said: “As a mark of gratitude, I am very pleased that we will be able to offer some of London’s key workers – including members of the Metropolitan Police, TfL workers and NHS and London Ambulance staff - the chance to watch England’s group matches against Croatia, Scotland and the Czech Republic in the fan zone on Trafalgar Square.
“If we continue to keep on top of the virus, we hope to be able to host up to 9,500 fans in the fan zone after the initial first two group games – and I cannot think of anything more exciting than thousands of people coming together to cheer the England team on to glory.”
Mr Khan, an avid football fan, added: “International football tournaments in England have provided so many highlights over the years – from Sir Geoff Hurst’s hat-trick in 1966 to Paul Gascoigne’s wonder-goal against Scotland 30 years later.
“I am sure Euro 2020 will provide more than its share of memorable moments.”
A family-orientated “football village” will be set up on Potters Fields park, next to City Hall, with free activities for children and adults, performances, football drills and community activities.
The tournament begins on June 11 in Rome. Wembley is due to host eight matches. The semi-finals are due to be played on July 6 and 7. The final is on July 11.
If England progress from their group stage, any “round of 16” and quarter-final matches will be screened.
The Euros will also be celebrated in London with the French street artist JR taking his epic black and white portraits across the city.
His Inside Out project will transform Tower Bridge Road into an outdoor art gallery, celebrating community heroes from the pandemic. A photo-booth truck will also travel to other parts of the city.
The Inside Out project uses large portraits in public places to “spark conversations” on diversity, feminism, racism, climate change and art.