Duly noted, though it's worth waiting for those people to say so themselves, I think.

With the co-gm against it, though, I've come up with a few more event ideas.  Some are edited versions of the alteration challenges.  I did not count 'I Bet My Life' as an alteration challenge.

[b]Thunderstruck:[/b] All characters are moved to a new and exciting arena, where one selected at random by the Viewer is 'charged'.  This has no effect on their appearance save for a faint electric aura that makes the charge easy to recognize.  The character acquires a point every second while charged, and anyone who touches the individual is charged instead, making this a chase kind of game.  Special movement abilities for a charged character, like flight or teleportation, are limited.

[b]Play Ball:[/b] Some kind of super sport involving a ball, obviously.  Rules are up to the Viewer to decide, but two teams is the most likely option.

[b]Land Before Time:[/b] The city returns to nature, sporting prehistoric sights like tar pits, steaming jungles, slimy swamps, lava flows, and glaciers, and it gains an unhealthy infestation of dinosaurs, mammals, reptiles, bugs, sea creatures, and more, from Stegosaurus to Dimorphodon to Pulmonoscorpius.  The objective?  To survive the many dangers of the ancient world and find the magnificent Golden Egg.

[b]Life is a Highway:[/b] A grand demolition derby in an epic arena, with personalized vehicles and a whole lot of mayhem!  Think a slightly less grim Twisted Metal.

[b]Harder, Better, Faster, Stronger:[/b] everyone gets mechs.  Whether it's a race, a battle, or something else, the Viewer chooses.

[b]Smoke + Mirrors:[/b] Every character is hunted by a palette-swapped doppelganger of themselves, with stronger abilities.  It's up to every character to figure out the trick for beating their clone, be it outsmarting, eliciting help, or some other method.