Thread:Su712/@comment-31762568-20180607232749/@comment-25669516-20180623074429

The rewards are one-time, for completing stage 7. After that you start getting the usual amount of trophies for beating the event.

Not sure if these rewards replace the old ones (I doubt it though. Otherwise why make an additional round for them). If you've already completed the event then the tries do not refresh so you'll have to pay 70 gems for entering grand mode. Coins for regular - or wait for the free try till next day.