Few people have the tradition of lighting mavilakku for Emperuman and some light mavilakku specifically for Thiruevvul Perumal during Thai and Adi amavasyai; so while lighting such a lamp, it is imperative to draw padi kolam at the entrance and can offer festive thaligai to Emperuman. But on other amavasyai days drawing kolams is not in practice.
Notes:
Some houses do not have the practice of lighting lamps but they celebrate these days festively, so follow as per the household tradition.