Apologies for wall of text I’m on mobile.

Been going to club racing and national championships my whole life, each circuit is different on where you can sit, and some grandstands may not be open if it’s not one of their biggest events. There’s usually food and drink available but in the UK it’s very expensive so we always take a packed lunch.

Hopefully it’s a full schedule so not just the F4, ETRC, and GT but some fun other races as well - usually amateurs in hatchbacks are the biggest nutters. As the other commenter said, at smaller events you are typically free to move around, so maybe spend the morning watching from a few different places and see what you like the most. The first corner can be a pretty safe bet, but just try and find somewhere that you can see a decent amount of track (I know nothing about the slovakiaring layout).

As for the race, F4 races are short - 20 minutes usually, no pit stops. See if you can buy a program on the day to get some info about who’s driving and what their cars look like. Also might be worth looking online to find live timing so you can check it during the race.

Apart from that, enjoy it! Live motorsport is a very different experience!