I'm surprised the article doesn't mention the concert hall. It's one of London's most famous, with almost 2000 seats, and it's the London Symphony Orchestra's main home.
Until last lear, The Lead Developer conference (https://leaddev.com/) was held there, but it's moved to a larger venue for this year (I don't think the size of the main hall was the problem, it was the areas for break out etc.) They had a great talk about the history of the place: https://leaddev.com/leadership/you-are-here-the-story-of-the...
The Barbican Theatre is one of the London homes of the Royal Shakespeare Company, although they are looking to
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