Dear student,

CSAB - CENTRAL SEAT ALLOCATION BOARD, is responsible for filling the vacant seat in NITs, IIITs and gftis . Csab round counselling is generally of two rounds.
Every year, after the josaa all round counselling is finished, the csab counseling is held.
The official date of csab counseling 2020 is still not yet released.

Now if you want to participate in this csab counseling, then the condition is -
First : you must have given jee mains 2020,
And second : you must not accept seat in josaa counseling (or withdraw your seat), because if you accept the seat then you will be not eligible for csab counselling.

Also check out more information about csab counseling :-
https://engineering.careers360.com/articles/csab/amp