Hi Megha, there is a club by the name of Royal Kennel Club in Delhi and I guess they allow mixed breed class. They organise a dog show almost every year in spring dales school (near Dhaula Kuan)
To get your dog registered so that it can participate in the show this year you may need to contact Dr. Rajeev Seth on 9911167766. Last year dogspot coverd this show, and you can find various show photos on the following URL http://www.dogspot.in/dog-even ts/
Please feel free to post your questions.