Master Windu event

It's been 77 days since the last event. Legendary events are typically 95-110 days apart. Exceptions exist, however. What's interesting here is that there were only 28 days separating the last event from the event before that. I don't remember why, but it might have been bugged somehow. If not, then it was something to do with wanting to make Mace available in coordination with something else. Again, I really don't remember. But if it was a bug, then it's theoretically possible that they want the next occurrence to be soon, as if it had been 28 + 77 days since the last event. (105 days total)

Otherwise, we wouldn't expect it until 18-33 days from now. 

Either way, within the next month is a good guess. You can keep track of this stuff at SWGOH Events (the website or the Discord server). 

https://swgohevents.com/event/mace-windu