Frost palette
Russet Square
Five frost stops with room to breathe — #004656 grounds, #007088 and #308ba4 do the talking, #5299ae softens, #6eb5cb lifts. The analogous bones keep it coherent across event posters that compete with a wall of other posters. The darkest and lightest stops clear AA as a text pair.
cyanfrostfive-stophigh-contrast
#004656
#007088
#308ba4
#5299ae
#6eb5cb
The generator opens with #004656 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.