Right now people seem to have to post any events they are organizing in the ‘Fan-Generated Content’ forum. I think it would be nice if there was a specific forum for guilds to announce their events and contests so people could do there and see them without needing to fish through all the other non-event posts.
Perhaps even with a function to filter by server?
Check my GW2 Comic Dynamic Events
http://goo.gl/JyB3J (Short Google Link to Fan Content Forum here)