, ▁the ▁Ind y ▁L ights ▁Fre edom ▁ 1 0 0 ▁moved ▁to ▁Car b ▁Day ▁in ▁ 2 0 0 5 , ▁and ▁the ▁concert s ▁have ▁been ▁held ▁since ▁ 1 9 9 8 . ▁In ▁ 1 9 6 9 – 1 9 7 2 , ▁Car b ▁Day ▁was ▁held ▁the ▁Wed nes day ▁before ▁the ▁race . ▁From ▁ 1 9 7 3 ▁to ▁ 2 0 0 4 , ▁Car b ▁Day ▁was ▁held ▁the ▁Th urs day ▁before ▁the ▁race . ▁It ▁was ▁moved ▁to ▁Friday ▁before ▁the ▁race ▁beginning ▁in ▁ 2 0 0 5 , ▁at ▁which ▁time ▁the ▁Ind y ▁L ights ▁race ▁was ▁moved ▁to ▁that ▁day . ▁Prior ▁to ▁ 1 9 6 9 , ▁Car b ▁Day ▁was ▁not ▁on ▁a ▁fixed ▁day ▁of ▁the ▁week , ▁instead ▁it ▁was ▁simply ▁scheduled ▁for ▁a ▁n ond es cript ▁day ▁mid way ▁between ▁the ▁final ▁day ▁of ▁time ▁tri als ▁and ▁race ▁day , ▁and ▁was ▁sometimes ▁closed ▁to ▁the ▁public . ▁Part icular ly ▁with ▁the ▁advent ▁of ▁the ▁sometimes ▁ag gress ive ▁Post - Qual ifying ▁Monday ▁practice , ▁the ▁Car b ▁Day ▁practice ▁session ▁is ▁typically ▁discipl ined ▁and ▁relatively ▁t ame . ▁The ▁object ives ▁of ▁the ▁teams ▁might ▁be ▁to ▁conduct ▁basic ▁leak - check s , ▁and / or ▁other ▁minute , ▁last - min ute ▁adjust ments , ▁but ▁ref ra ining ▁from ▁ag gress ive ▁driving ▁and ▁avoid ing ▁inc idents .