I really hope the reason why Koki doesn't want Gopi to join them be that she wanted Gopi to come with her.... and also wanted Gopi to participate in the competition.... as i feel by the way she behaved with Gopi today she'll forgive her.... and not only that Koki mentioned that only by practicing one can't win the competition the main thing required is your heart and determination to win.... i really feel she'll teach Gopi...
Or maybe something wrong might happen in the club resulting in Rashi not able to participate and maybe Jigar will take the initiative to dance with Gopi as he was the one who taught her steps...
I feel the reason why Rashi-Urmi want Gopi to be there is because they can show off in front of Koki that her daughter in law did not participate.... thus infuriating Koki and creating a wrong name for her....