Use location data for setting of the time zone.

If the event is assigned a location, the timezone should be set based on that information. I think this should able to be turned on and off by the administrator. In the event settings module we could have four different settings for the timezone:

Use the sitewide time zone
Use the time zone of the user editing or creating the event
Allow users to set event time zones
Determine time zone base on location information.

Anyone have any idea how to impliment this?