The “you can unlock reward levels whenever” is 1000x more real life friendly setup than the previous events where you need to unlock something 1/day/every day.
So i just wanted to give this positive feedback and encourage you to stick to something similar in the future as well 
took em an awful bit to realize
I’m posting this just in case they didn’t realize but this is yet another experiment.
Knowing how these experiments often are run, i just wanna tell the people in charge that:
Even though you might look at event impact on daily recurring engagement or something like that, this is way better in player satisfaction, positive feeling towards the event and game and playing fatigue perspectives, which are harder to measure with hard trackable metrics.
+1