It depends which region you choose as the study centers are there in all over Delhi so you can check region wise centers by going through the below link -

http://rcdelhi1.ignou.ac.in/studycentre/centre

http://rcdelhi2.ignou.ac.in/studycentre/centre

http://rcdelhi3.ignou.ac.in/studycentre/centre/1

Also, the classes are conducted on weekends only (Saturday-Sunday).

Good Luck!!!