I got there early, and while I was waiting noticed a number of people appearing who seemed to be in weird costumes. OK, so that's normal in London, but there did appear to be a steady stream of them. It was when I saw a woman appear dressed as the lead character in Clueless that I twigged it was some kind of theatrical event.
In addition to her, I saw characters from Legally Blonde, Starlight Express, Matilda, Moulin Rouge, Cabaret, The Great Gatsby, Tina Turna and Burlesque. Most of those names probably have — the Musical appended to them.
So, we'd happened to choose to meet on the day the ticket booth officially reopened, for which there was "star-studded celebration" to mark the occasion (the reopening, not our meeting). It had been selling tickets for several months, but yesterday Eric was the last person to buy a ticket (for a show tonight) before they closed it so they could open it.
Here are a couple of characters (from Cabaret and Matilda) getting their hair touched-up by professional ahir-toucher-uppers.
I'm not a fan of musicals so have no idea who these people are.