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KiedyKoncert
Every confirmed concert in Poland in one live calendar. Made by Łukasz Król.
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About
KiedyKoncert is a concert calendar for Poland. Type an artist or a town and you get confirmed dates on a map and a list, with links to ticket sellers and an alert you can set without a password or a newsletter.
As of 7 Oct 2026 it lists 7,213 upcoming concerts by 4,975 artists in 393 towns and 1,259 venues. Data comes from ticket partners, organisers and public sources, merged into one card per concert. Artist pages show the whole tour on a map, and there is a separate guide to festivals in 2027.
It is built for people who want to know when their favourite band plays nearby, without checking five ticket sites. One person built it after hours, writing code with Claude Code and Codex (1,619 commits since July 2026).
What went wrong
Merging feeds from several ticket partners kept creating duplicate concert cards: adding 730 Eventim series dates on 30 Sep 2026 meant merging 58 duplicates. On 28 Sep a single rejected offer blocked the whole KupBilecik feed (about 5,000 offers) for roughly 12 hours.
At a glance
Gallery
| Measure | Last period | Period before | Change |
|---|---|---|---|
| Google clicks, 7 days | 687 | 397 | up 73.0% |
| Google impressions, 7 days | 44,237 | 24,268 | up 82.3% |
| Verified visitors, 7 days | — | — | — |
| Google clicks, 30 days | 1,459 | 683 | up 113.6% |