As convenient as it would be for me to know in advance I must admit I like the nature of them happening "randomly". You can't schedule a magical disaster!!! Also, it rewards playing and not just logoing on for 20 mins then logging off (well, standing in a tower earning those sweet sweet welfare plats) Not trying to argue just throwing out my 2 cents.
would love this random stuff to happen in a better time for EU, although its hard enough to get online as little as I do, I can only imagine what its like for Chris and co. I remember the Trinsic town invasion back in the day, so anything like that is amazing.