I also ended up stuck with a bunch of tokens I cannot transmute anymore and have literally nothing of use to spend them on.
Maybe next time at least warn us that the transmuting will only work during the event.
Oh and being cheated out of even logging in this morning before maintenance (EU) made it even worse.
Note to self, just don't ever bother with these shitty events, not worth the effort. Or find a different game to play.