Guys I will give you an invaluable advice - You get Stamina potions in abundance - USE THEM.

I use like 20 of them, Since I had stocked up on almost 200. These events - where you flip cards to get A SHIT METRIC TON of items are where its most worth to use them. Dont worry about using them, there are many promotions where you get them daily plus the one for doing quests, so really its best to pop them bad boys and chug down that delicious delicious liquid stamina.
This way you will never be stress pressured to get your rewards before the Event ends. Or you can use it to bullrush through an event like that so that you can spend those extra days you freed this way on other things that you might require like Whaleship, Elixers, Manyus, Dragons, etc etc.