The great tamil festival "Pongal" starts with Bogi. Bogi Festival falls on the last day of Margazhi month of tamil calander. Traditionaly Bogi festival is for Lord Indiran, who has been worshipped as "God for rain". This festival is to thank Lord Indiran to give enough rain for the harvest.
But generally, on this particular day every one clean up their houses, get rid of old unused items. In tamil it is called "Pazhayana Kazhithalum Pudhiyana Pugudhalum". In villages people collect all the old, unwanted items and they bornfire in centre of the village.
Also, people paint the houses, put kolams and color the kolams. People take oil bath and make poli, vadai, payasam for neyvethyam to God and in particular Lord Indiran.
Happy Bogi and lets celebrate environment friendly bogi festival.