They had a second 5* guarantee gacha like 2 weeks after launch but it was limited time. It was probably for how unstable the game was. I wouldn't hope on getting another one but just in case make sure you have an extra 5 flower gems. Also yeah so far the event seems pretty "easy" although its honestly more farming then regular 3* events. I'm at 1.6k silver earned so far so I think ill take it easy until part 2 comes out (already 3* everything).
It would be cool if they added some extra stuff to buy with silver such as Ampys, Manyu, or even dragons.