Is Praying On New Year's Eve A Bidah?
And their intention is not to introduce something new to the deen
Of course you can pray nafil namaz anytime for any reason – that’s not innovation. Bidah or innovation would occur if they made it into an event, invited others to join them, publicized it, or insisted upon it being part of the religion. Simply praying nafil namaz in their own homes is not bidah.