You cannot publish a calendar under the following circumstances:
You cannot publish a calendar that was created using the New Proxy Calendar option, but you can publish another user’s calendar if you access their GroupWise account using the Proxy function. A calendar that was published when you are proxied into another user’s account will be published under that user’s account.
Shared calendars can be published only by the owner of the calendar; if you are not the owner of the calendar, you cannot publish it.