Emergency Encounter Design [3.5/PF]

[Tael]

So, our normal GM is going to be sick for tomorrow's session, so it falls to me to run something cool and interesting without any major investment or startup time. I was thinking about a gladiator style arena game, when the PCs have to fight for their lives against a variety of foes and encounters.

Any tips about what to run, interesting encounter ideas, or similarly sage wisdom?

[Tvtyrant]

Have a high level Wizard/IotSV "test" them by summoning monsters at them from behind his veils. He can summon lots of types of monsters (being level 20) and targets their weaknesses. When he runs out of spell slots he leaves claiming to be "entertained."