This is the most recent post I could find on issues with Goaled Events.
I've read this is not a bug. Although, I don't fully understand how it isn't one. I hadn't the option to tick on goaled event.
I'd planned birthday parties for various child sims in my played household which had gone quite well UNTIL.. I'd started joining my teen(s) to high school. Evidently, high school attendance is considered a goaled event if you go along with them??
So after which, I couldn't plan birthday parties for each of my household's remaining child sims as these fell on weekdays because, 'you cannot have more than one goaled event in a sim day'. I don't recall the exact message but that's essentially what it'd read when hovering over the unavailable option to mark it as one. So I had no option to tick on a goaled birthday party event following the game's apparent 'join to high school' event. I hadn't realised.
To clarify..if you want to throw a bash for your child's (or toddler's) birthday, you can't do this if you choose to follow a household teen to high school? Is this similarly so if you choose to follow an employed adult in one of the GTW careers? Is this accurate? This is what I'd experienced in game... but this isn't a bug? Is EA/The Sims 4 team sure about that?