I just hit an Upgrade your Festival Manager to Level 4 quest
I guess diamonds will be necessary to keep up the 1 town a day rate. It's been a good start, but looks like it will have to slow down. Still, 17 days to go, a new town every 2 days, a Grand prize every 2 days still means another 8 grand prizes, so 2 or 3 of them should be Celtic Forest upgrades. so only 2 or 3 needed from chests to complete the set and upgrade it. More than that though, this event is entertaining and addictive. I hated those spinning gambling wheels where you just click and hope for the best. I really do love this event. Yeah, stuff it, I'm going to buy a few more diamonds