I'm with Samira on this, I think its a gross exaggeration of what happens at most events. I know the groundbreaking festival event we ran back in December was completely unscripted on our part, and I'm fairly certain on other people's parts as well. (Ironically I'd meant to write a speech for Saede and preplan a bunch of stuff but then didn't have time because I'd mistimed thanksgiving and had to end up doing everything off the cuff).
I think that most events tend to be largely freeform, save for a few things the host might work out with some people loosely in advance. To give an example from talking to Katrina last night, no one but her and the shooter knew she was going to be assassinated, it was totally out of nowhere for everyone else, and they were left scrambling trying to figure out what to do. What they did was up to them, it was completely unscripted. Really the only things you need to cover out of character are things that really harm your character. If I pull out a gun, and threaten to shoot your character, that's not godmodding, it isn't godmodding until I /emote shoot your character in the head. The phrase 'the ability to swing your fist ends at the tip of my nose' comes to mind. But swing away. Just get OOC permission before you actually land a punch. That's pretty much the only scripting that needs to happen, and that's really not all that much considering.
In a lot of cases (using Katrina's assassination arc again as an example) its best to not script things too much. If Katrina had told the people she was with OOCly that the assassination was going to happen, a large portion of the impact of the event would have been lost. Too much scripting can be just as detrimental to RP as no scripting. I RPed with some people a few years back who wanted to spell out everything ahead of time, and it just wasn't fun. At that point, why roleplay it out at all? Why not just write it out as a story? Roleplay is supposed to be largely freeform, organic, and improvised. When you put it completely on rails, the fun goes out of it. I don't think putting it on rails completely happens very often, so I tend to agree with Samira that the problem discussed is rather exaggerated. I certainly take specific effort to talk to new RPers, and I know quite a few others do as well. There's plenty of room for off the cuff roleplay, as long as it doesn't harm another character. Its only when harm comes into play that OOC discussions need to occur.