Jeds makes a good point and the thread he linked to is good reading.
cone race courses: Do you mean autocross, also known as "solo" by the SCCA? If so, for autocross the main requirements are no missing lug nuts, battery secured, good throttle return springs.
Open track days. These events are targeted towards street cars. So for non convertible cars you just need OEM 3 point belts and safety inspection.
Where are you located? You mention Buttonwillow as local so I'm assuming you live north of the grapevine?
EDIT: just saw your location. There are a number of autocross events at the Marina Airport which is a little over 100 miles from you. You can probably find stuff closer too.
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