This is somewhat offtopic, I believe, but I am not quite certain I understand how LARP works.
For example: How does one regulate success and failure? Does it use rules such as D&D, and the players simply represent the 'minis' that one would normally use? Does the player's physical actions have impact on their 'mechanical' actions?
I've never seen any LARP and the like so I am entirely ignorant of how it 'really' works.
I just ran my first LARP, a halloween Cthulhu Live game. Our awesome LGS let us take the place over, giving me three rooms to work with.
In those rules, yes, it wasn't too dissimilar from having players walk around instead of using minis. They were also in costume and there were lots of props. As stated, the rules in LARPs can vary. In this one, players had attributes rated 1-20. Something simple required a 5, challenging 10, hard 15, and impossible 20. If you have a skill in something, you apply the relevent attribute. If you don't, you subtract 5. It is all kept very minimal, so the GM can have everyone's stats on a clipboard.
For combat, the GM calls Action when people declare their actions. You gesture your prop toward the person you want to attack. Make a fist to attack, applying all of your Dex to attacking. Make a peace sign to put half on defense and half on attack. Make a palm to put all on defense, and turn around to flee. Works well enough.
But everyone was in costume, and we made use of props. When they found the old journal, I'd actually written up a journal for them to find and read. Characters with weapons had toy versions, and even connived hiding the shotgun in a trench coat. The 'photographer' used a modern digital camera rather than something old-timey, but that's okay because we have in-character pictures.
Plot-wise, you can make use of anti-characters. In the plot that I had, a wealthy man invited some investigators to a dinner party to discuss the manner of his father's death. After the dinner but before they could get many details, the lights wend dark and he was dead (He had a ripped shirt on under his button-up, and some fake blood worked wonderfully.) My roommate had offered to help out, so she served the dinner dressed as a maid.
When they got to the kitchen, they say that the roast beef they'd just eaten was on a plate along with a severed head and foot, covered in blood, with bloody torture implements hanging nearby. The maid was also here, armed with a pistol and opened fire. A journal informed them of the plot - the father has infected Malcolm with his curse and a monster was after him. He plotted to do the same to the PCs, only making a human sacrifice out of the butler this time, and bribing the maid to help him.
They get the key to the library, go upstairs, and start reading. I'd laid several books around and hidden papers and newspaper clippings inside them. They found a ritual that would let them summon the monster and kill it. They lit a candle, poured a circle of salt on the ground, and did a Latin chant. The guy from the first scene put on a cloak and mask, and appeared in the center. They'd armed themselves with silver and managed to finish the monster off.
Everyone had a lot of fun.
