Kalpi did ask Raghav not to come to the chawl.. But she was missing him every moment..
She was watching her aai baba and everyone celebrating Holi.. And wished if only Raghav was there..
She didn't play and enjoy and didn't let anyone apply her colour.. Bcoz she wanted Raghav to apply her first..
She imagined Raghav applying her his colours of love and chasing her everywhere and that finally brought a smile to her face..
Raghav on the other hand was disheartened thinking Kalpi doesn't want him to be there..
However he couldn't stop himself from visiting his lady love..
The song Tum Hi Ho beautifully captures the feelings of their hearts and the scene was beautiful beyond words..