A city day show: a finale for the whole square
Viewers scan a QR code on the stage screen, raise their phones, and thousands of flashlights flash together to the music. Commands come as ultrasound through the square’s speakers, so no mobile internet is needed. No fireworks, drones, permits or clean-up
Event technologies
A synchronized light show from viewers’ phones: each screen and flashlight becomes a pixel of the shared picture
Works in the browser, no app download required
Works on whitelists, even when the internet is blocked
Flashlight sync without internet via ultrasound, no load on the mobile network
Mapping the picture from flashlights by row and seat or by geolocation
Pricing
Total
3,900$
Fixed price for the entire event
Fireworks, drones or flashlights
- Fireworks: in 2026 public tenders Barnaul put 8 minutes of fireworks out for 1.4 million rubles, Chelyabinsk budgeted more than 5 million. Venue bans and clean-up
- Drones: a district in the Komi Republic tendered a drone show for 3.52 million rubles. Cancellations due to wind and flight permits
- Flashlights: the whole square takes part, launched from the stage sound desk, and after the show viewers see the celebration partner’s page
Cases at big venues
A flashlight show at the Sirotkin concert at SummerSoundOn August 13 the audience raised their phones, and a screen behind the band showed the show liveRead
A flashlight show at the Sirotkin concert in St. PetersburgAugust 23, Roof Place: our second show at the band’s concert. Videos by @whoisanyaaa and mikk.filmRead
A flashlight show at the Pavel Pikovsky and Vasily Urievsky concert in Nizhny NovgorodOn September 12 we controlled the whole hall’s flashlights and drew pictures by seatReadRelated articles
A city day show: how to run a mass event and a finale without fireworksWhat it takes to run a mass event, how to build a city day programme and how to make a finale the whole square takes part in, without fireworks costing millionsRead
Pyrotechnic, fire and laser shows: prices and what to use instead of fireworksWhat pyrotechnic, fire and laser shows cost, where they are allowed and what to use instead of fireworks at a wedding, corporate party or indoorsRead
A drone show alternative: what the sky costs and what the stands costA drone show costs hundreds of thousands of rubles, depends on the weather and needs permits. Stands with flashlights give a similar effect in minutesRead
Concert advertising: formats, prices and what actually performsA breakdown of advertising formats at concerts and festivals: branding, screens, sampling and promo in every viewer’s phone with 25–30% conversionReadFAQ
- What does the organizer need to provide?
- A screen or projection with the QR code, sound across the square and a host announcement at least a minute and a half before the show. We prepare the script and control tracks in advance
- Can it be combined with fireworks?
- Yes: first the square lights up with phones, then the salvo
- Does it work when the network is overloaded?
- Yes. Commands come as ultrasound through the speakers, the show needs no mobile internet
- Can the celebration partner be shown?
- Yes. After the show a partner page or a prize draw opens in viewers’ browsers, so city day advertising gets measurable clicks
- How much does a city day show cost?
- The price depends on how many viewers the event will have. You can work it out in the calculator. More in city day show
- Does the show need separate permits at a mass event?
- Not for the show itself: there are no pyrotechnics or drones, and viewers use their own phones. All other mass event requirements stay with the organizer