There aren't any spectator facilities as such but there should be no problem with turning up to see whats going on.
The events offer great value for money at venues with huge run off areas so there is minimal risk to people taking part, you don't need a race license (this is sorted out as part of the package), there is only one vehicle on your part of the track so you dont have to worry about pulling over for other cars or having someone get ion your way and spoil your lap.
All in it is a great opportunity to get your alfa on track, see what it can do at your own pace and get a feel for how fast you are going via the timming equipment and see where you can improve on your lap times/improve your driving.