GST query registration

Resptected sir

if i am unregistrer in delhi  under gst due to turnover below the registration if i am participating exhibtion out of delhi such as in maharastra then only casual GST requiered or alsos required normal gst for delhi

or 

we can send through eway on casual gst from take delhi to maharastra and when complete exebtion then send from maharastra to delhi on maharastra casual eway bill id through delivery challan in both cases 

please confirm these movement thourgh casual eway id through dilvery challan we can do this