So, after about a thousand tries with my undergeared Ewoks and without Logray, I gave up trying to 7* C3PO for this time.
My Logray was at 8/100 when the event started and the only thing I had to make sure, was that I have a 7* Logray before the next time C3PO shows.
But, I'm still at 8/100, he literally didn't show up ONCE in the last 2 weeks. I check every refresh and always keep currency available, but NOTHING!
Anybody having the same problem?