No, they're triggered. The walkthrough is more of a rough guide than a walkthrough. It must have taken forever to compile, but it's not too useful, sadly. Use it as a rough guide when you're stuck rather than a hand-holding list.Are the events (Mom peeping, checking breasts) random? I'm following the walkthrough and I'm not getting the same events. Creator says to just keep leaving until you get the right one, but it never seems to work.
Once you meet the trigger conditions, the given event either happens next time or is enabled with a random chance and needs repeating (usually not too many). The pink page on your contact list helps, as does searching this thread.
(Hardest one for me was finding the right mix of actions for the drinking session with the lawyer - had to get help from this thread for that)