So something that has no religious significance is ok in itself, but try and bring some religion act into it and it becomes bid'a?
wouldnt it be more productive to bring some act of ibadah into it?
Peace Ma Mooli
No ... bringing in of religious act does not make it bid'a. Making the occassion itself into a religious act, is. By bringing in religious acts into it and making that a habit may turn the activity into a religious act in itself in future.
But the main concern is not the ibadah done as a result of the occassion it is the occassion itself. I don't think the creation of Pakistan is something to celebrate. It represents a Muslim loss!
However, we have it as a stark reminder a time to think and mend our ways not to rejoice and celebrate.