Here is a helpful UI Action to launch a Calendar Workspace.
The calendar workspace scope isn’t documented and you may have a hidden Task UI Action to launch a calendar workspace. In case you missed it here it is:
Scope: CalendarWorkspace
CommandID: LoadWorkspace
Confirmation: null
Command Data:
{
‘ObjectType’:’CalendarWorkspace#Project Calendar’,
‘SearchCriteria’:[
{‘ObjectId’:’Frs_CalendarItem#’,’FieldName’:’ParentID’,
‘Condition’:’=’,’FieldValue’:’$(ProjectNumber)’}
],’FilLSearchPanel’:’false’
}