Disc Realms is a big semi anarchy server that has that old school feel with roots going back to 2013.
It has an active community and dedicated staff so you can get support fast when you need it.
There are weekly events that sound like a lot of action and the season release is happening now.
You can join on Java from 1.8 up to 1.21.x and Bedrock on the latest version.
Disc Realms Semi-Anarchy Season Launch
Active staff teamclassic anarchy rootsevent focused gameplaylong running conceptseasonal survival world
GG.MINEWIND.NET New Server IPMaze Runner Civilization Event Season 4

I found a server called Split SMP that runs big civilization events every month or two. Each season has a new twist and this one is Season 4.
GG.MINEWIND.NET New Server IPMaze Runner Civilization Event Feb 21
apply to joincivilization style eventevent focused gameplaymaze themed gameplayorganized community play
I found a server called Split SMP that runs big civilization events every month or two. Each season has a new twist and this one is Season 4 with a Maze Runner theme.
The event starts Feb 21 and it runs for 7 days. Players get split into four teams so it is all about teamwork and trying to win with your group.
They said past seasons pulled around 150 to 250 players and they are trying to hit 500 this time. Over 200 people already applied so it sounds like it is getting busy fast.
GG.MINEWIND.NET New Server IPWITHER STORM SURVIVAL EVENT SERVER

This is a Bedrock survival server built around a Wither Storm event. The world is meant to feel dangerous and you are here to survive the chaos.
The server uses the Decayed Reality V2.11 mod. Wither Storm destruction is expected so your base might not stay safe forever.
There is a simple rule set. No griefing bases and you need to listen to the owner. The main goal is to have fun and survive.
GG.MINEWIND.NET New Server IPCollideCraft Time Zero Lifesteal SMP

This server is called CollideCraft Time Zero and it feels like you crash into a broken world. The dimension is messed up and space is tight and resources are not easy to get.
It is a semi vanilla SMP with some light lore so it still feels like normal Minecraft but with a story in the background. Survival is not handed to you. You have to earn it and it feels pretty intense.
There is lifesteal so PvP actually matters a lot. There are factions so players team up and form alliances and probably break them later. The plugins are chosen by the players so the community has some control over how the server plays.
There are frequent events and they hint that there is more hidden under the surface so it feels like you will keep discovering new stuff as you play. The server is on Season 3 and this one is called Time Zero so it feels like the world and time are all scrambled.
You have to join early if you want to secure a spot because they use a whitelist so not everyone gets in right away.
GG.MINEWIND.NET New Server IP
