Absolutely, as an option if you're in a particualr mood to race a specific circuit, it's not a bad idea to see all the races associated wth that circuit, but there really needed to be somewhere you could go through the actual events themseves so if you wanted to do the GT.3 cup you could just find that competition and all of the races associated with it.
Perhaps they didn't include that as it would further show just how barebones the single player career actually is though. They would literally have 38 events, that's the fewest we've had since GT1 (there were 23 events in GT1, GT2 had 101 IIRC). Sure there's the missions as well, but they're one time bonus content like the licenses, not proper events.
As has been mentioned previousely/elsewhere, more events are sure to be added, at some point, but it's shockingly short of content at launch and there's no guarentee even with new events being added it will approach to volume of content to complete of other GT Games.
GT3 had 71 events
GT4 had 143 events (not counting driving missions)
GT5 had 54 events (not counting B-Spec or the special events i.e. karting and NASCAR school etc. or seasonals)
GT6 had 65 events (not counting seasonals or speical events like the Moon Rover over Goodwood Festival of Speed races etc.)
And back in the PS3 days people found GT5 and GT6 lacking in events, which is natural after the number provided in GT4. It seems PD have a somewhat regressive atitude towards how much single player content they need to provide outside of numbers they can print on the box (cars/tracks).