Sumi palette
Polar Archive
Five sumi stops with room to breathe — #9c0032 grounds, #b52645 and #007675 do the talking, #d5475e softens, #009393 lifts. The tetradic bones keep it coherent across event posters that compete with a wall of other posters.
redsumifive-stop
#9c0032
#b52645
#007675
#d5475e
#009393
The generator opens with #9c0032 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.