yes what you buy is a 'weekend ticket' which from my experience at spa and silverstone is basically like a pass for the circuit during opening times on the race weekend, ie fri, sat and sunday.
you can go to the track when it first opens to the public and leave at the last hours if you want.
during the day there might well be touring car races, formula ford, porsche supercup or whatever other things (a few years back I watched a cycling races at spa up eau rouge :| very weird! - it lasted 4 hours round the entire circuit lol!!!)
but as turkey is a new track im unsure of other races that take place.
im only aware of silverstone, donnington, brands hatch and spa, and the daytime was filled with things to watch every other hour or so.
where do you currently live, is turkey the nearest track?
Jenson drives it like he owns it; Lewis drives it like he stole it