Only time you should ever waste jewel/gold on reviving is for Ragnorak difficulty as you can only run it once per day and it uses no AP. Assuming you can use potions on it.

Otherwise it's a complete waste, you're better off dying and spending jewel/gold on a potion to refill your AP so you can do more multiple more runs.

You have a week to learn which events quests you can handle. You shouldn't be running something you won't clear at the last minute to begin with.