I think you're getting a lot of ambiguous answers.but during the game is it possible to know if you miss any events?
The short answer to your question is: Yes, it's easy to miss an event due to you choosing a specific route.
That's just how it is with games that have branching storylines.
It's also true though, that you don't need the walkthrough to advance, as the quest log should be sufficient. If you are like me though, you'd prefer to know exactly what you're walking into before making a decision, which means you need a walkthrough