I asume you mean the new events for 0.9.0. If so, I think you need to trigger the secret event to get Maya's events to trigger. You need to meet with Maki to get Sana's event to trigger, then I believe just hang out with her at the bar. For Rin, you just have to go to the coffee shop in the morning on the weekend.
[Edit] Just realized you mentioned main events, which there were none this update, so ignore the message above, whoops. Which main event is the next on the list which wont trigger for you? Likewise, which is the next event that hasn't triggered for each of the girls?