GST on temporary structure for exhibition outside state

We are a company which provides installation of temporary structures for exhibitions.  We have a contract to install a structure in chennai and our agreement is with another event company in banglore.  Both of us have registration in Tamilnadu.  The event is for a company which have registration in tamil nadu but their agreement is with company in banglore.  In this case do we need to take casual dealer registration in TN.  Thanks in advance