i won't personally agree with this suggestion. Because mostly i organize hydra dodge event in the server. i can guess this is how this idea appeared in your mind to have it as separate server event. But if it'd become server event, than it wouldn't be entertaining anymore. Players need new things. Hydra dodge is one of the best events of mine. So i want players to wait for it and enjoy when the times come.
There are already many cool server events avialable. players can enjoy them as well. For hydra dodge, i want to organize and don't want it be server custom event.