Been looking to try out a 5pc gear set using weapons/jewelry from the arena, the worst-case odds of getting the weapon I'm looking for is after about 39 hours of playing the same solo content (30 minutes per run on normal, 78 runs to clear the sticker-book for weapons).
It's something that I certainly can do over time, and hey, I might get lucky, but I've read about maelstrom arena events in the past.
Orsinium seems to be noted in the upcoming 10th year celebration, and I'm wondering if it's likely there will be something like a double drop event for maelstrom again.
Haven't seen anything that might point to it though, but maybe I've missed part of an article.