Also how to start the Themyscera event?
Supposedly you just have to take Superwoman henchperson to Legion Hideout after completely unlocking Donna Troy and Cassie (and I guess prolly Wonderwoman, but she should be fully unlocked before you get others), but I have unlocked 'em all and still can't trigger Themyscira... so I dunno.
Edit: No, as another later post of mine will confirm, Themyscira will start with Grail showing up at the Legion hideout, but one has to be sure that all Amazons (Diana, Donna, Cassie) have to be FULLY unlocked (all costumes/all events) plus Roulette plus Superwoman henchperson for it to trigger. In my case I hadn't quite gotten all of Cassie's costumes, but once I did it triggered.