I completed all three. I didn't particularly like it but I also had literally nothing else to do last week.
Last December, I 100% did 5* and 6*. This time, I stopped at 2.2M in 6* and grabbed a couple of milestones in 5* to round out a featured 5* crystal. I repeatedly experienced game lock, disconnects and signal issues that made my rounds lengthier than they normally would have been. It’s not a bad idea overall, but it’s pretty grindy in the best of circumstances. With the way the game runs now, it’s masochistic and not befitting a “celebration.” Dr. Zola