You may want to check with one of the Indian video rental stores, they are well aware of the Indian movies in HK -- usually once or twice a month at the convention center.
Also, email kalra@netvigator.com (I think thats the address) they are responsible for bringing the Indian movies into town.
After a bit of research I got the number and called at 2368 2947.Baghban is being screened at the Jockey Club Auditorium at Hong Kong Polytechnic University at TST (East) on the 5th of October (Sunday).Shows at 1515 hrs and 1945 hrs.Tickets priced at HK$ 80 & 130 each.