▁In ▁early ▁dec ades , ▁Sund ays ▁were ▁occasionally ▁used ▁for ▁practice ▁and / or ▁qual ifying , ▁but ▁were ▁used ▁sp aring ly ▁in ▁pre - World ▁War ▁II ▁years . ▁In ▁some ▁early ▁years , ▁practice ▁may ▁have ▁been ▁permitted ▁on ▁Sund ays , ▁but ▁the ▁gates ▁might ▁not ▁be ▁open ▁to ▁the ▁public . ▁When ▁Tony ▁H ul man ▁bought ▁the ▁Speed way ▁after ▁World ▁War ▁II , ▁Speed way ▁management ▁continued ▁to ▁refuse ▁to ▁schedule ▁the ▁race ▁on ▁a ▁Sunday , ▁a ▁policy ▁that ▁stayed ▁in ▁place ▁through ▁ 1 9 7 3 . ▁Qual ifying ▁and ▁practice , ▁however , ▁were ▁regularly ▁held ▁on ▁Sund ays ▁during ▁those ▁years , ▁with ▁no ▁days ▁closed ▁to ▁spect ators . ▁From ▁ 1 9 1 1 ▁to ▁ 1 9 7 0 , ▁the ▁race ▁was ▁scheduled ▁for ▁May ▁ 3 0 , ▁regardless ▁of ▁the ▁day ▁of ▁the ▁week . ▁If ▁May ▁ 3 0 ▁fell ▁on ▁a ▁Sunday , ▁the ▁race ▁was ▁scheduled ▁for ▁Monday ▁May ▁ 3 1 . ▁For ▁the ▁first ▁ 5 0 0 ▁in ▁ 1 9 1 1 , ▁May ▁ 3 0 ▁fell ▁on ▁a ▁T ues day . ▁In ▁ 1 9 1 5 , ▁May ▁ 3 0 ▁fell ▁on ▁a ▁Sunday , ▁and ▁the ▁race ▁was ▁initially ▁scheduled ▁for ▁Saturday ▁May ▁ 2 9 . ▁He avy ▁ra ins ▁fell ▁in ▁the ▁days ▁leading ▁up ▁to ▁the ▁race ▁flo oding ▁the ▁grounds ▁and ▁made ▁some ▁d irt ▁roads ▁leading