I've read the yokai watch event, and this is what I took from it.

[Felis]

How I see it:

normal medals: 100% drop if you finish a FATE with gold or silver rating
minions: buy them with the normal medals
special medals for the weapons: not 100% drop from FATEs if you do them with a yo-kai minion
event duration: around 2 months

[Zojha]

Everyone's gonna do it regardless. Look at how much we whine about relics, yet we trudge on :P

Uhm...I actually rather like many of the relic steps ._.'

Namely every single one that doesn't involve crafters or relies on RNG or waiting hours for a specific FATE.

[AlphaFox]

Everyone's gonna do it regardless. Look at how much we whine about relics, yet we trudge on :P

We whine about it but do it because we want the reward. Doesn't mean we enjoy or like the idea.

[Ignnis]

Fate Train 'noot noot' *rides off into the sunset*

[Jacien]

How I see it:

normal medals: 100% drop if you finish a FATE with gold or silver rating
minions: buy them with the normal medals
special medals for the weapons: not 100% drop from FATEs if you do them with a yo-kai minion
event duration: around 2 months

In addition, the amount of Legendary Medals needed for weapons increase as you collect them.