A person once asked whether eating the feast served after Nikah is Halal or not as it is not proven by Sunnah. "Should one attend it or not?" Hazrat said, "Tell me. If a guest comes to your house do you offer them food or not?" Then Hazrat said, "The first point to understand is that every act that is not a Sunnah doesn't automatically become Hara'am unless there is a specific reason for it being declared Hara'am. No one considers the meal that is offered after Nikah a Sunnat or Farz (mandatory) according to Shariah. However, if people start believing that it is a Sunnat or is Farz according to Shariah then it will become a Bidah (new practices being introduced in religion)."