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Dance off with bardbarians
Characters that high of level need some REAL challenges. Planar adventures can typically include that. There are SO many options there between Elemental, Shadow, Chaos, Infernal and Celestial planes. Mythic rules could be introduced for added threat and advancement of characters. Kaiju, Nightwraiths, Terrasque, Behemoths, Drakainia, Arch-Devils, Demon Lords, Raveners, Horsemen of the Apocalypse, etc.
Level 20 NPC's can also make for an interesting fight. Like an Evil adventuring party or guild of villains. Maybe throw in some templates like Half-Fiend, Vampire or Graveknight. Use dangerous classes like Anti-Paladin, Assassin, Undead Lord, Blight Druid, Wizard, etc.