I have finished the zombie quests through the 10 Dark Adepts and 10 Priestess of Chaos banishings. I am not even attempting to complete the event, since I was gifted all my certificates and don't feel the need to waste my chargers trying to charge each collection multiple times.
The charm is not worth frantically trying to complete the event. I received the annoying, an most unhelpful Monsters charm last go round. It is still going 21 days later....and you can't use a turtle while it is running after the 1.10 update.
So, is it safe to use up all my weapons?
The treasure chest reward for the island event seems to be much more worthwhile. What do you get for completing the Olympics Event?