Do IIT Guwahati organise spot round for M.Tech admissions?

No, the Department of Mechanical Engineering generally does not organize any spot admission for postgraduate courses. The first list is released after the initial counseling. The further lists are released depending on the seats available till that time. This procedure is repeated until the 4th list is released wherein the newly selected candidates have to take admission on the first day of registration, and classes start subsequently. 

Occasionally, a change of specialization is allowed even after the commencement of classes although there is no provision for spot admission. However, sometimes instead of publishing the 4th list, the Department may go for Spot Admission to the waitlisted candidates. This once happened in 2015. It all depends on the vacancy and nothing is fixed. 

Spot admission takes place in IIT Hyderabad and IIT Madras although there is no guarantee of any particular choice of streams even department.