I did say they were events where reveals were possible, not events that will have such reveals. That said, E3 probably will do the reveals of those characters of all. I was just listing those events based on what I have read from other people, but hey, anything is possible.Honestly; I'll be surprised if any of those events other than E3 produce a character reveal. I imagine E3 will give more detail on Lucas, and announce up to 2 new characters, one being Ryu because 3rd party. The other is probably Roy as he's another veteran, and I imagine those taking the spot pre-ballot. Wolf is the only other character I think likely to be announced this early though I would be happy to be proven wrong. EVO and CEO is probably nothing; I remember everyone last year thinking the same would happen and it never did.
As for the Fire Emblem concert, I have no idea how that got the steam it did other than it seeming to fit conveniently with the Roy leak. Other than that it is just Sakurai going to a concert. If he went out to McDonalds, I honestly wonder how many people would start screaming "Ronald McDonald confirmed!".