Do you have any tips for writing character-provided events?

The tips below are distilled from a lot of time spent writing character-provided tournament scenarios. They cover a lot of "best-practices" stuff, as well as warning you away from all-too-common "worst-practices".

Fun

• Sense of Adventure
• Scenario Not Out To Get Them
• Interesting & Different
• Good Rewards
• Exciting Pace

Fair

• Each Character is "Winnable"
• Each Character Has Equal Importance to the Scenario
• Setting/Background in Explainable in 15 Minutes

Consistent

• No Anachronisms
• Fits the Campaign Setting
• Fits the Game System
• Internally Consistent
• Just Makes Sense

Well-Produced

• Spell-Checked
• Edited
• No Missing Maps/Handouts
• Read-Aloud Text is Readable
• Formatted Correctly