The event idea in champions can be good and bad.
Before it have been processed, I assumed, people thought about how they would have felt if WoW vanilla players held a WoW centric event in COX zones? If they are fine with it cool.
Now things to keep in mind. First and foremost, CO is not Champions and not everyone on champion liked or cared for COX. Even some ex-coxers players in CO may not be too keen on the whole movement thing, thus do not be overly sensitive and or condescending to those that may not partake or just don't get the purpose. That right there will sink the view of any movement in a game. Some people like to hold a family reunion in France then get there and start dissing everything about France and how their old reunion place that burned down is way better than France and etc. Don't do that. Well of course I cant demand that don't be done, but I can tell you and know that it wouldn't be good way to get the point across.
And don't be generally disruptive or make it obvious that the only reason many are there is to high jack the bandwidth of a game as an advertisement for this movement. That will cross the line in many people eyes.
And lastly don't forget respect. Respect that is demanded for the "right" to gather, respect those that may not want to be or see a point in it. Assume good faith. Some people that attend and do these movements in public get way too snappy too quickly and immediately view everything that is not praise as an attack.
Come to think of it, I think Captain Electric pulled one of these off not long ago. It was out of the way, didn't force it upon anyone in the zone or the chat channels, didn't diss people that chose not to attend to didn't see the point and didn't worry about NCSOFT. It can work, but overall just respect the fact that it's in another game and think how people would have reacted if WoW players bogarted COX servers, because they wanted to protest changes.