No they didn't. There was one after JLD and there was one about a month before JLD was released. There was also one right before Atlantis was released. So far we have had five bonus artifact XP weekends. Three out of the five came at most a month and a half before a new batch of artifacts were released, and one a few weeks before XP packs entered the Marketplace. Bonus weekend 1 - May 10th 2018. Kryptonian Time Capsule with new artifacts released on June 27th. Bonus weekend 2 - August 9th 2018. Artifact XP was added to the marketplace on August 23rd, so it could be argued that this double XP weekend was done in order to drive sales of the MP XP which would be released a few weeks later. Bonus weekend 3 - November 1st 2018. Atlantis was released November 8th with new artifacts. Bonus weekend 4 - February 28th 2019. Justice League Dark was released March 28th. Bonus weekend 5 - September 5th 2019. This is our outlier. There were no artifacts with Metal Part I, and so the next one we received weren't until Part II was released the following December. So the pattern is there. Whether that keeps up remains to be seen, but my guess would be that we see another bonus artifact XP weekend in March. I'm not denying that money is the driving force behind all of this. In fact money is most likely the very reason for double XP weekends. That's not me bashing the game or saying "oh those evil devs!" What they're doing makes smart business sense because they're draining the XP from our inventories right before they give us a reason to buy more. They've found a monetisation system that works well (just like Time Capsules) and are keeping on to it. There will always be people who pay through the nose to get the very best things as soon as possible. Yes, there are optimal artifacts to run with, but they do give many people choices in how they build their loadouts and whatnot. I often inspect the random players I play with in duos, alerts and raids and they always have a variety of different artifacts.