Prom and graduation problems

Hello, I removed all mods and CC from the game, but I still didn't have prom and graduation on my calendar. So this is game bug. Prom and graduation only showed up when I completely turned off aging for all Sims. My sim got to the prom, it also asked me if I wanted to go there. At the graduation, I was not asked at all, I had to click on "go to the event" in the calendar. But the problem is when I had twins or more Sims in the household - only one Sim and some NPCs "received" the diploma at the ceremony - so only one Sim had that photo in the inventory. However, they did not actually receive the diploma at all, it was neither in the inventory nor arrived by post. My Sims also had regular clothes on graduation.

Why do events (prom and graduation) appear in the calendar only after I turn off aging completely? Why are not all of my Sims getting called to get their diploma when attending their graduation?

Is anyone else having these issues? I'm already desperate.

Thank you