Race day is always the 3rd Saturday in March.
The 12 hours is on Saturday March 16. Practice and testing starts on Wednesday March 13 if the pattern of previous years holds.
The gates open on the 13th and they have other races and things going on all the way until the main race on the 16th. It's worth making the whole event. Wednesday - Saturday.
Fanfest on the 13th,5 to 9 on the circle
March 14, 15, 16.
March 14-15 according to racing news.
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