Retro palette
Maritime Hollow
From #8f2b35 ink through #a64148, #00767a, #c45c61 to #009499 light, Maritime Hollow is a analogous progression that holds together at any size. Use it for event posters that compete with a wall of other posters.
redretrofive-stop
#8f2b35
#a64148
#00767a
#c45c61
#009499
The generator opens with #8f2b35 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.