High school is a mess, no prom or grad, events messed up

Product: The Sims 4
Platform:Mac
Which language are you playing the game in? English
How often does the bug occur? Every time (100%)
What is your current game version number? 1.99.264.1230
What expansions, game packs, and stuff packs do you have installed? get to work, get together, city living, get famous, parenthood, seasons, cats and dogs, island living, growing together
Steps: How can we find the bug ourselves? playing with teens at high school
What happens when the bug occurs? no prom or graduation, sims go to before prom together and then everyone disapears leaving only my sims and then prom doesent happen on the saturday, instead on a random day, also the cheer and football festivals are on random days and weird times, graduation doesn't happen at all
What do you expect to see? prom on saturdays and graduations as normal
Have you installed any customization with the game, e.g. Custom Content or Mods? Yes
Did this issue appear after a specific patch or change you made to your system? Yes
Please describe the patch or change you made. horse ranch

‌

help!!!