Goodwood hosts two major events- the Revival and the Festival of Speed. The Revival is a lot of fun but you aren’t allowed in to many areas without wearing period clothing. There are usually some historic aircraft flyovers as well- Spits and Lance primarily.
The Festival of Speed always has a featured marque as well as as a timed hillclimb. You will see F1 cars, Touring Cars, NASCAR stockers, and dragsters. A few years ago an early Hurst Hemi Under Glass Barracuda was there and put on quite a show.
Goodwood also hosts smaller monthly gatherings for specific clubs, etc., but the Revival and the Festival of Speed are the hallmark events.