After doing a this event a couple times I have found a pretty good guide that could possibly work against this event, feel free to add some more ideas that could be good to use.
Defending- First of all lets start with defending the gates from the twisted horrors, it takes at least 15-20 people to fend of the mobs but you need to do it right. The best way I have seen to beating these mobs is using barracas to slowing down the mobs such as making lots of turns, to do this when you make barracs make it so the mobs have to go from left to right and so on, since the mobs can’t go through the barracs this is the best way to stopping them. Second, you need 5 people defending from the back and the rest to the front, since most of the mobs spawn in the front most of the people should go in front and if mobs spawn in the middle people from both sides can go and kill them since a few mobs spawn at a time. Besides this all golems should go in the front and help everyone there and arrow carts can help the front or backside. This process will be helpful when following to the next guide.
Attacking- The first problem with this event that I saw was that there is not enough people doing it because of overflow, because of this you need to come up with strategies on how you will win. To start out it is best to try averaging out the people to all 5 paths, during this event you will fail a couple times from a couple reasons one being that you have to rely on all 5 groups of people that are fighting the wardens to do their job and kill them, if one of them fails the whole mission fails. The first path to go is the bottom one and goes clockwise to all the other paths, if you have 20+ people averaging all the paths than you should get through two broken chains after that it starts to get difficult. You get three chances to finish the whole event or else you fail so you can use this as an advantage, when path 2 is almost breaking the chains half of path three should go to path 4 to support that path by doing this you will fail doing path 3 but will increase your chances in path 4 ( will result in 1* people defending 3* people attacking and the first guide will help the remaining people defend and once over they will need helping the other paths defend from the mobs), during path 4 half the people from path 1 will need to go to path 5 and help them breaking the fourth chains at that time the sickness buff will run out (sickness lasts 5:30 and each path takes 2 mins) and they can do another path, if everything goes right you should be on the last chain, path one can try and beating the last chain but will most likely fail since this is the hardest path and will have only a few people but would be best to skip path 1 and go right to path 2 and help path 2 destroy the last chain, this might not be enough people so some people from the rest of the path who are not debuffed to go finish the last chain off with still one chance of defeating warden 5 if anything goes wrong.