Your next event Become invincible is not fair for all players, I started to upgrade a spell this morning or yesterday and i still have to wait 3 days and 5 hours.
I think all the people that have started upgrades before the announcement of your festival won’t be able to benefit from it because they started the upgrade before the anouncement. Some upgrades take up to 7 days. Will the event reduce that duration ? or all those people will miss the event?