Here is my idea... make it game in an closed out urban environment with cameras everywhere, so don't miss the action.
Have weapons available in different areas but they have to get the weapons via an obstacle course ala Ninja Warrior. Now the weapons would be stun weapons that could be used as knives, swords, and others as staffs, etc.
A very limited amount of armors and shields will also be available.
The participants would encounter each other an engage in hand to hand combat, weapons against empty hands, weapons vs weapons, etc. in specific locations. The participants would use non lethal force but are able to use whatever tactics would allow them to win their matches. Each match would last 15 straight minutes no breaks. If another opponent comes in proximity they would also have the opportunity to jump in... join forces with another player or fight everybody. In the end there can only be only one like Highlander anyways so no matter the alliances they will have fight each other.
Only one participant will win once all others have been "offed"...
Heck make a 30 day thing with limited food, water, etc like Survivor.
NOw, that would be a show I would watch...lol