The time slot events are all the same and don't require changing anything - morning events happen in the morning, afternoon events in the afternoon and night events at night still. The only difference is that now you have "evening" as well, and there's no specific events for that yet (although anything that isn't locked to a specific time slot will work during the evening slot). :)
CK is my first game, and I'm a solo developer, so when I started out I made three time slots because I figured that would be enough. As the years went by, I began to realise that I'd restricted myself too much... what if I want everyone to have a dinner event? A star-gazing event? A sunset party? Afternoon is too early, and at Night most characters are asleep.
So the "evening" time slot was added to allow me to work in more "night" events that made sense in context and to give players a little bit more time to do things, so they didn't just have two actions per day to get everything done :)