How can I hide a field called 'Workspace' from Calendar: New Event or Edit Existing Event?
Just hide the column workspace in the calendar. The place where you can also add columns. It is described in the link: http://mysharepointofview.com/2009/01/hide-form-fields-in-sharepoint/
using google ... http://dev-tips.blogspot.com/2010/05/hide-fields-of-sharepoint-calendar.html or http://www.blog.anuanjan.com/?p=71 or http://moblog.bradleyit.com/2008/10/disabling-workspaces-from-sharepoint.html