Of course you can blame them. Events should be pre planned and done right. If they've put it on a thursday like all other events, no one would complain. If they've put it on the events page and said it's coming Monday (Why monday ffs, 3 days?) sure, no one would complain. If they even put that there's gonna be an event later in the week and not tell us what it is it would be fine, even if they just hinted on it.

But this? Just putting it out there near the end of the event week cycle and give and excuse that it was "not planned, u're welcome guys" it's pure rip-off and inconsiderate. Especially with the release of the cave, bigger spenders have already spent on it, recharged and consumed the ingots. I'm not one of them, but why spit in their face and demand more money? This recharge event is gonna be the best one ever to be released, and they do us like this?