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Here's the NWS forecast rainfall along the path of Ian through Sunday morning:
Rain showers are expected to move into the area Friday afternoon, and increase in frequency through the evening. The WeatherTech qualifying session has the potential to have a shower, but I expect it to be light enough to allow the session to be held. Friday night won't be great for campers as rain picks up. Showers will continue to be on and off through Saturday morning, which could impact the morning warm up session. But the frequency and intensity of showers will be falling through the day, and I think all 10 hours of the race can be held without major disruption.
With the track of Ian being farther to the east, wind will not be as much of an impact. It will be breezy every day, with sustained winds of 15 to 25 mph, gusting between 30 and 35 mph at times. Objects will need to be secured to keep them from blowing around, but I don't think this should be a safety issue for campers.