Time Out says
The West End's free outdoor extravaganza returns for 2019
Musical theatre fans, get ready for outdoor dancing and sing-a-longs with some of the West End's biggest stars: West End Live is back on Saturday 22nd-Sunday 23rd June, 2019. It's the initiative that turns some of the most expensive forms of entertainment in London into the cheapest fun going. Each year, casts of some of London's best West End musicals emerge blinking into the open-air for a weekend of free alfresco performances in Trafalgar Square, accompanied by fun photo ops, merch stalls, and bags of showbiz atmosphere.
The line-up's still tba, but you can usually expect some of the West End's biggest faves to regale the crowd with a song or two, plus a chance to get the odd sneak preview of new and upcoming shows.