two words: please don't.
not in this form.
please don't be offended, i like the initiative that you want to do something new, it kinda worked with the st patrick's day event. but this is a huge miss. this event is too complicated and even repelling to new and unexperienced players, and just utter nonsense for experienced ones.
the rewards don't make any sense, two buildings that each have to be upgraded to level 6 for one to even start to think about building them, that's 12 kits of which 4 are obtainable by finishing the quests and one more by getting into bronze league, that means you have to get 7 more if you want complete buildings by crossing the field and that just doesn't seem likely. silver league is almost impossible for a regular player since winning matches and therefore moving up leagues is totally based on pure luck. any setup i tried, the chance of winning the matches stayed between 40 and 70 percent. you could upgrade your players as much as you like it will still be based on luck and luck only. and that's not right. the basic league system worked just fine, you played more, you got into a higher league. and giving 200 fp's, 1k goods, winnners plaza lvl2 and 2 selection goods of the global top1 (one single player!) is also nonsense. i mean whoever gets that place is already a huge diamond user who can buy anything (and everyone knows that so no normal player is even thinking about getting that place therefore it has no motivational value), so you're just giving them stuff that they would buy otherwise so you're robbing yourselves of a diamond purchase, and that's not even a good business decision imo. just being in the gold league is enough for everyone who is there already. the portraits are a good idea though, we would be playing for no1 only for that.
the middle chain pieces, the tracks are trash. they take up 4 squares, can only be placed in certain places, and give 3 goods, one fp, or 3% defense for attacking? that last one is 5 TIMES!!! worse than a lvl2 sentinel outpost. why would anyone build it? there is no point in even having that building in the game.
leveling up players doesn't make any sense either, they still have an impossibly low chance of doubling the rewards and since it's randomly chosen who will be on the field in training mode, also pure luck and that method just doesn't push anyone to collect players, why not just give us regular rewards instead of collectible cards? you basically made two events that are connected by the collecting of player cards, but those cards have an entirely different purpose in the two modes. if that's not disturbing enough, you can't choose if you want to collect them, which of them you want to collect, there is 15 of them and you don't know what's the difference. they give different rewards, sure, but it's still totally random what will appear on the field, so why would anyone care about that? when playing a match in tournament mode, they just lose all meaning as they are practically reduced to being blue, green, or red.
overall, you have two event currencies, basically two events (that are built around the collecting of your team and leveling up players, but noone understands why do we have to do that, since it virtually doesn't change anything), and once you figured these stuff out, you go and play tournament mode where you are introduced once again to three more values, 1. the little stars in the top right corner of player cards, 2. the number after the little team pic with three men, 3. the number with the golden, silver and bronze stars in front of them.
what the hell are those? how are they calculated? why do they matter? what the hell is happening in general?!
please remember that sometimes less is more, this is a great game for the tens and hundreds of thousands of your players, and we come here to play and relax, not to wrap our minds around something that doesn't make any sense and is overall pointless.
and also, you created a very complicated and sophisticated game 8 years ago, and even if many of us know all the peeks and perks to it, many don't, and we all play the game everyday, have our main cities and now even settlements to look after and think about, and the point of events should be to help us with going forward in the game and not to take our attention away from it.