Thanks Brenden for your quick reply.
No, I haven't done anything explicitly but Yes, as I have cloned the Events(CMS.EventManager) module to create the New module it automatically created all the child or nested objects and can see on User Interface section of the module all code names are appropriate. The first thing is I want to see the module listed under "Social and Community" section and then I will modify all the default Events code files(.aspx).
Have you ever created any module by cloning other module ?
Is there anything extra need to do to show the module under Left menu (Like registering custom module on code etc.) ?
On cloning window I have choosen the following settings
New object display name: Our Events
New object code name: OUR.EventManager
Delete clone on failure : true
Keep fields localized: false
Clone child objects: true
Clone children up to level: All levels
Assign to current site: true
Clone site bindings: true
Clone module permissions: true