The maths gets there before the laughs do. Chortle has put 30 acts on the bill for its London Fast Fringe preview at the Pleasance Islington on Monday 13 July. The venue’s own event page lists the running time at 140 minutes. Take off the links the host has to do between acts, take off a bit of unavoidable changeover. The working comic on that bill is looking at four minutes, maybe four and a half, to convince a Cabaret Bar full of bookers, reviewers and a Monday-night audience that they should buy a ticket to a full Edinburgh hour in August.

That’s the trade. A £15 ticket buys a Pleasance punter a kind of speed-dating tour of the Fringe a fortnight before previews season properly opens up. A Fast Fringe slot buys the comic the one thing that costs more than the hire of a Pleasance room. That thing: somebody from Chortle in the room while they’re on.

Five minutes, possibly four

The Chortle announcement names 30 acts. The Pleasance Theatre Trust’s own event page for the same show describes “a jam-packed bill of 28 comedy and variety acts” with the rider “full line-up to follow.” Two acts may have dropped between the press release and the box-office copy. That is the most Edinburgh-preview thing that can happen to a bill seven weeks out. Nobody’s going to issue a corrective. This is a long-running showcase format, and the running order on a Fast Fringe gets scribbled on the back of a printed call sheet about an hour before the doors open.

What Chortle has named is a roster heavy on character and clown: Rosalie Minnit, Rory Marshall, Jonathan Oldfield, the double act Burger And A Pint. Alongside them are stand-ups like Tom Little, Omar Badawy and Hannah Byczkowski, the musical impressionist Jess Robinson, the drag act Fanny Bleach, and a magic turn from Tom Brace. (“Variety” in the listings does its usual work of meaning “anyone with a prop.”) There are musical extracts from two Fringe shows, Remember, Remember and Mothman. That is the format conceding that some of these acts can’t really do a stand-alone four-minute version of their hour.

“A snapshot of the world’s biggest arts event in all its variety, insanity and hilarity in one night.”

That’s the pitch on the Pleasance event listing, and it’s worth reading twice if you’re on the bill. “Snapshot” is the operative word. Four minutes is the running time of a trailer, which is what any working comic on this bill should be cutting for the night.

What £15 actually buys at Pleasance Islington

Pleasance Islington’s Main House seats 230 in its full theatre layout. Fast Fringe goes into the venue’s cabaret configuration, which is the same room with the front rows turned into tables. The Pleasance event page lists the ticket at £15 plus a £1.50 booking fee, capped at £6 across an order. There’s a 2-for-1 on the first 20 tickets with the code Preview241, which is also the most Edinburgh-preview thing on the page. Every comic on the bill is going to forward that code to their list, and the first 20 will go inside an evening.

A standalone Edinburgh preview at the same venue, with one comic doing a 60-minute work-in-progress, sells at a similar price. In raw cost terms the audience is paying nothing extra for the variety. What they’re paying for is the chance the host has miscalculated the running order and the last six acts end up doing 90 seconds each. A 19:30 start with a 140-minute listed runtime is going to clear the bar nearer 22:15 than 21:50, and a Monday crowd notices.

The Dome runs the same show for £7

Chortle is doing the same trick at the Edinburgh Fringe itself: a Fast Fringe slot at Pleasance Dome at 18:30, listed at £7 on the venue page (Wednesday 5 August on the listing I checked, with daily runs through the festival according to the Chortle announcement; 12 acts per night up there rather than 28 or 30). Same brand, less than half the act count, half the ticket price. The Edinburgh version is doing what every preview pricing strategy does in August – competing with the 3,649 shows in the official Fringe programme that have to land at £7-12 to fill a 4pm room. London on a Monday in July has none of that pressure, which is how the same idea ends up costing more than twice as much.

For comparison, a “value” comedy festival ticket elsewhere this summer runs £29 for five acts at the Bristol Comedy Garden tent. £15 for 28 acts is, on any per-act basis, the cheapest comedy night on the calendar. The trick is that nobody is buying a ticket here for the per-act value.

The reason any of them said yes

A working comic’s August spreadsheet is a brutal read. Pleasance rates for a full Fringe run regularly hit four figures before you’ve thought about a flyerer, and the Gilded Balloon show support fund hands £2,000 each to five acts – which is currently the single most generous bursary the city has and gives you a sense of the gap between what’s there and what’s actually needed. Most acts have been running the Fringe equivalent of a kickstarter campaign for months.

The Fast Fringe doesn’t pay anything towards that. The comic is on for the exposure to whoever from Chortle is in the room and whichever reviewers showed up because seeing 28 sets in one Monday night is good value for their time too. A two-line preview mention from any of them between mid-July and the end of the first week of August is the single most cost-effective marketing a Fringe show can have, and it’s the sort of credit that has knock-on effects: it’s a much easier sell to an audience back home if your tour poster carries a Chortle pull-quote than if it doesn’t. Compare it with how Sarah Millican’s ISH newcomer prize is now bankrolling £4,000 of Edinburgh accommodation specifically because everybody knows the cash isn’t the only point.

The other quiet purpose: it’s a sense-check on the opener and the closer. Four minutes isn’t enough material to bomb a full hour, but it’s plenty to tell a comic whether the cold open they wrote in May is going to land in a room of strangers at 7.30 on a Monday. A few acts on the bill will rewrite their first 30 seconds in the cab home.

Arthur Smith and the long walk to Cally Road

Arthur Smith linking 28-or-30 acts for 140 minutes is the unsung labour at the centre of the whole evening. Almost no other comic of his standing would do it, and he does it every year. The Fast Fringe doesn’t function without a host who can absorb a five-minute death from the seventh act and reset the room for the eighth. If you’re on at this thing, the polite thing to do is buy him a drink at the bar afterwards. The Pleasance Islington bar is upstairs, the dressing rooms are downstairs, and the only people who reliably make it to the bar are the ones whose set didn’t go well enough to leave the building immediately.

Quick word about transport, because somebody has to: the Caledonian Road end of Carpenters Mews is a nightmare for cabs after a late finish, and the Cally Road bus stops fill up fast on a Monday because the night buses don’t all start running until later. Allow yourself an extra 20 minutes if you’ve got a train. Nobody warns you about that in the press release either.

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