I keep an eye on the prices of the invites and mess with the frequency of the events based off that. Before the anniversary, the invites were super common. I've been adjusting the frequency since then because seriously they were more common then the throw a pie or blackmoon events.
The event is still common, just not the low number it was before! Like I said, I've been watching it and adjusting (like I just changed it today, so you should be seeing them a bit more).
Like I said, I increased the chances of finding the invites earlier today. :) Going to be keeping an eye on prices / how many go out over the next week or so to see if I need to change it again.
Yeah I messed with the odds of the pieces going out too. Keeping an eye on them so it doesn't take like 30mil to complete the set but not like 200k either haha