Against my better judgment, I made an attempt at the event because I thought the fox is cute. It took me two full days of sending deliveries plus this morning to get enough gro to reach stage 3. Since the event started, I've sold around 10,000 coins worth of deliveries, which includes the coins spent to buy stuff from the newspaper and neighbors trying to get requests filled. I've lost track of how many stupid picks I've sold.
There is no way I can get enough gro to finish the upgrades in the time left. I don't have the gems to buy the ice block (would leave me wiht just a handful) because I've spent a few here and there finishing off something in all the events on top of each other without the time to replenish them. Not going to waste any more time on this event. And I think I can save even more time on the next event.
I'm glad some people are successful. I just wish the game was still like it was when I started playing a few years ago and most players could be successful with some work (or even lots of work).