These are some ideas of the events that i had hosted in my old server:

treasure hunt
-find the rare item hiden in the city and bring it back to the GM. Winner gets rare item, equipment or zeny.

hide & seek
-find the GM in the hiden temple.Winner gets rare item, equipment or zeny.

item collecting
-collect certain amount of the required item (example: 5000 jeloby's) and bring it back to the GM. Winner gets rare item, equipment or zeny.

MORE TO COME SOON.. GOT TO TAKE A NAP FIRST!!!

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i know some event ideas that i play with my friends on a different server like, a pk SIGHT and seek, its like hide and go seek but u have to use cloak or hide and beable to use sight and the last person standing/hiding wins

Ok, this is proly an old post, but Event ideas would be like Desuising as aNPC and have a Hide and seek event..thats waht i think would be cool^^

How about EDP event ? a GM picks a town and summons lots and lots of those mobs from lhz that drop poison bottle (Eremes i think ) and gives 10 min to the players the player who gets the More bottles keps them and gets a Prize >_> works for me ... did that on a serv i used to be a gm on .

let me think this kind of event...

post more ur suggestion here...thx