But this was far from a bank run.
This was Revolut, Europe's most valuable fintech business, hosting a free gig with one of world's biggest pop stars, Charli XCX, days before her sold-out UK arena tour.
The concert by the woman whose album redefined the word brat was a flashy stunt - part of the digital bank's mission to cleanse a controversy-dogged image and snare young customers before what could be a blockbuster UK flotation.
It capped off a two-day party at London's subterranean Outernet venue, where 3,000 mostly fee-paying customers were treated to panels hosted by the sports pundit and prospective Match of the Day host Alex Scott; challenges against the gaming sensation TenZ; and pitch sessions with Dragons' Den's Steven Bartlett and Revolut's wealthy co-founder Nik Storonsky.
The occasion? Reaching 50 million customers worldwide.
This means Revolut, co-founded by the former Lehman Brothers banker Storonsky in 2015, has leapfrogged more established lenders such as the 159-year-old HSBC, which has 41 million customers worldwide.
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