Advance warning, long post. tl;dr don't give up. :-)
EDIT: dang, Teika wrote a great reply and posted while I was still composing. A lot of good advice there, and shorter, lol.
I'm sorry that you are discouraged. :-( This event is the first of its' kind that I've seen. No typical bottleneck, no Ivy or Troll Camp, etc. The bottleneck here, pure and simple, is ENERGY. I haven't checked the kingdoms of people who have posted that they are done. But I suspect you will find that they have an Army of Alicorns: a veritable Host of Heaven, lol. All drop 40 weekly. And every week the person doesn't play, they log in and collect from them all and save up energy. So you'll see people say they have 1000 energy "banked." They are old-timers and are playing a different game than you and I are.
In contrast I have two handfuls of droppers. How did I get these? Events, a couple of doorbusters and a big investment on Black Friday. I started playing in March that year, and didn't get my daily 4-6 droppers until an August doorbusters, and the rest until November. It was a lot of waiting.
There are two kinds of players in a typical free app game: people with time on their hands but not much money, and people who have jobs and thus have some money but not much time. I'm in the former category, so if I'm especially interested I can log in frequently to use the free 40 fill-ups that occur every 2 hours. I know not everyone has that luxury.
This event is also unusual for having no reduction for lower levels, most of whom don't have an army. Back when I was low level, we'd finish first and the high levels would be vexed that it took them longer, lol.
I had some RL stuff to tend this week, and very little interest in battling my way to a level 10 building with my limited resources. I've crapped out at level 8 and I doubt I could finish even if I wanted to.
I posted before that I regretted it both times I sat out an event, but I'm hoping I won't this time. I have a gold mine from Black Friday and it keeps me well stocked with eggs and apples ... not so much with gold nuggets. There are event prizes that feel worth chasing, but even with the lure of scrolls, these aren't very tantalizing.
Please don't give up. There's a lot of fun to be had here, and as frustrating as it is, managing resources is part of the tension that makes the accomplishment feel good. When you have a few more energy droppers you will feel less stressed. Besides, you are so fun to talk to and I would miss you very much.