Hi

Central seat allocation board conducts special round to fill the vacant seats left after JOSAA counselling for NITs,IIITs, and GFTIs. Students who were not allotted any seat in JoSAA or whoever wants to upgrade their previously allotted seat in NITs, IIITs and GFTIs can participate in CSAB Special rounds 2021.  The registration is completely online for participating in CSAB special rounds. A valid JEE Main score is the eligibility to participate for the special rounds CSAB conducts. As for the dates it will be posted in the website below

https://csab.nic.in/webinfo/Page/Page?PageId=1&LangId=P

Hope this answers your query!