I checked on Athenium Island on a few shards this afternoon and found that all of them still have minions. However, only Siege still has the statues of Scelestus the Defiler and Rhista, the queen's daughter. Even Formosa, a shard whose EM program also falls under Mesanna (not the Japanese team) and that is just as often ignored by the EMs as Siege, does not have the statues. I don't know if this means they had the event this weekend or not. Maybe the statues are placed by the EMs and the fact that we have them means an EM is planning to show up and Formosa doesn't have the statues because it has no EM to place them? Who knows!!
I may try wandering over to the Athenium Island on Balhae and Arirang, since they also have spotty EM service under Mesanna (I don't think Arirang has ever seen an EM) to see if they still have the Scelestus and Rhista statues, but since my peace tamers there are not that good and the connection is pretty bad, it may be a true adventure!!
Anyway, here are screen shots from the couple of shards I managed to visit this afternoon. As you can see from the journal, minions are still roaming the larger portion of the island. I didn't have time to find out if on these shards you can still complete the 1st tier of the quest from the Queen that has you collecting documents and being rewarded with a book, but I would imagine you still can. Didn't see anyone working the mionion spawns anywhere though.
Baja
Europa
Formosa
Siege