Why do TV channels fill time only with film based programmes

On special days (Pongal,New year,Deepavali etc),TV channels spend the entire day with film based programmes.While it was catchy in the beginning,it's becoming stale as the years have passed.Personally,i used to watch many of these programmes 6 to 7 years back but hardly watch them now.Recently ,on Diwali day Jaya TV has a musical programme with Kamal which was good but such things are an exception.Most of the time it's the same songs,scenes,interviews(filled with innane questions)concept.Can't this be changed? :huh: