Well, it's not easy to give suggestions. If you want to go the secure way, just take a tripod, aperture priority, set an F around 8, 10, or anyway "high", use the timer or a remote control and it should be fine. I did like this in the past and never had problems, alternatively, you put it in speed priority, set 0,5 or 1 sec and the camera will judge the aperture. Most of the time it would be fine, but sometimes cameras jsut go crazy. As said already, this year I went the full manual way as I always shoot like that lately, but it's not easy if it's the first time indoor. I can't remember what camera you have, but if it's a compact, keep min ISO, or else the noise will be too much. If it's a reflex, you can easily use ISO 400 and still have plenty acceptable noise and in that case you might not need a tripod. If the show is well lit, you should be able to shoot at 1/60, 1/80 or faster speeds using higher ISO.
Also, if light is "weird" you might need to set the white balance setting to something different that "auto".
Anyway, there are no real and 100% correct suggestions as every camera, lense, and car show, is different
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