While I agree with much of the criticism (positive as well as negative) that's been given, the critique I have is of a more general nature:
By making this into seasonal events, this can only lead to - I think - an "Oh, it's the Pirate Faction X's time of the year"-effect. That, to me, is immersion breaking. Why would the, say, Bloodraiders always come around at the same time of the year (other than them OOCly fitting the Halloween-theme), why should the Guristas ((other than bunnies OOCly fitting the Easter-theme)?
It just doesn't make any intime sense, at least I don't see how.
P.S.: That said, I see why it makes sense to have events at those dates OOCly. But why tie certain factions to specific seasons? I think it'd be much better and even possibly more interesting to have the events at those times, but instead of tying a specific faction to those holidays (Easter-GuristaBunnies, Halloween-Blooders) to deliberately break with those all-too-obvious fits. Have Easter-GuristaBunnies one year, but not every year. Rather, imagine how an Easter-Blooder-event would look like. Ofc, that woulod be a lot more work on CCP's side, so... I think it's not realistic to expect them to go that route.
Honestly, my biggest fear is that those events will just be exactly the same events each year (or only minor variations), so that in three years you have the weird situation, ICly, that when the Omir comes you can't really be surprised either ICly nor OOCly and can't do much more than yawning and say: "Oh, It's that time of the year again. Yah, Omir is doing that every year. I guess it's a defect clone - one that's similar to a vinyl record that plays the same part over and over again."