You can choose the venue for your event here or if it is not in the list enter it in the "venue" field on the left. Click on "geocode this" if no latitude/longitude coordinates have been entered and you want people to be able to see a street map for the venue

Venue:

Venue not in the list?
Go here to add a new venue

Geocode This
(optional) you can use this map to help you find lat/lon coordinates for the venue if you want people to be able too load a street map on the event page

(Map displays are provided by Google Maps)