Hi PokerLiga,
Just go to "My Events" under the Games menu and click on the little pencil icon on the left of your event. You can then edit any information.
I am trying to work out how people are using PokerDIY - I noticed you had quite a few people on your invite list - how did you add these people? Was it a group or just selecting random people (just curious to see how it is used).
Also - please be careful about sending too many mails - I need to work on the Preferences some more to let people opt out of the invites.