change concert chart to show most changed markets

[mmcghee18]

Instead of showing the top markets in the maps below, show the markets that saw the most growth. Each map needs to be brought in as an svg, and the numbers need to be updated manually in the code. For updating the line chart, you'll just upload a new data/concerts.csv.

[caitlynmralph]

• let's swap in 6 month line chart!

• i decided to take a stab at highlighting the increase in markets outside of the major hubs. could we change bottom maps to these cities? happy for you to pick different ones here, too. i pulled out a few with really big increases between 2017 and 2024 - maybe we could add that text to each of them, but it may get a bit cluttered? i also updated the copy to reflect this addition.

• big gravy thing here, i was thinking maybe adding in a hover / annotation somewhere with these two stats:

Since opening in 2009, Citi Field in New York City - a baseball stadium with a 40+ person capacity for concerts - has hosted huge artists every summer. The first K-Pop artist to perform there was BTS in October 2018, which also happened to be the first time a K-Pop ever sold out a stadium in the US. By summer 2025, over 50% of the artists to play were K-Pop, with the exception of The Lumineers and Post Malone (the Billy Joel concert was cancelled).
Stray Kids' tour was the second highest grossing global concert tour in 2025, just behind Beyoncé.

[caitlynmralph]

UPDATE 4/1/26:

https://polygraph-cool.slack.com/archives/DB1MDRM3N