All Player events that bring people together are good.
It depends on the events how many players come but always there are enough to come. They do come often at the last minutes. We announce events about 5 days before they start on the forums. And at the day of the event i announce the event several times 30 minutes before the event in ally and general chat.
Some events don't require preperation like the void pool challenge (Where we try to break the shard record) or Despise or fighting against Slasher.
Some take a bit more time like getting ships ready for pirating or hunting pirates.
Hunts on Medusa and Stygian Dragon been much easier to gather 40 keys and orbs cause we have a week time to gather them.
The knuckleheads have set up a nice webpage for their monthly auction event but it takes time to gather all the items and prepare them for the auction day.
Most time it takes for our 2 weekly exodus event. We encourage players to gather as many keys themself during the week but my guild try to gather 100+ keys for the event day.Exodus event is a big success but it also requires a lot of work.
We have fishing competition that takes as much time you want to put in.
We have a roleplaying event that we working together with the EM. The EM is realy great to help us out on it. What a lot don't know is that many works is done in "secret" to discuss our ideas and prepare all things. All the EM events and also the RP Event with the EM is done in 2 languages in Drachenfels. So all text have to be writen and Macros needs to be made in 2 languages. The hardest part is not the preperation but the players who expect items on EM event.
It somethign we discussed with the EM at the start of our Zalindera Saga, there will be no items to get. We rather do this event for 10 players who are interested in the story then 50 who comes for items. This sunday after theKings meeting we have the next chapter on the event. So if you coem for items, don't bother!
There more events i forget to mention but they all good. We have a good community and alliance on Drachenfels that work well together to make al lthe events possible and fun.