So my feedback on the events:

Numbers 1, 2, and 4 are completely irrelevant to me, and offer me nothing as a F2P player

Number 3:

Its a decent event, the rewards aren't much, but it does make me do the arena which I am always lazy with and save for last minute.

Number 5:

This event is very tedious but rewarding, I do enjoy it.

Number 6:

7 free spins and I will probably get nothing. The drops are most likely fixed like everything in this game.

Number 7:

Now this could be useful to me because it does offer coupon prices, but we literally just had a coupon drain event with the lucky board so I (and most F2P I know) are tapped out.

Number 8:

Seal rebates are always nice, but I will not be spending any seal scrolls because I am saving up for an Ultra in the next treasure.

Number 9:

Always nice to have a summon rebate during the spend 20 monthly mission.

Number 10:

It is nice to see some good and useful rewards in here, though I find the amounts to be rather low. For example the coupons are only 5 when the group wheel has a minimum of 10.