I have noticed that every holiday in the game has the popup for the Love Day holiday. They show up normally on the calendar itself. I even get the popup for the correct holiday starting the next day. But on the day of, the Love Day popup appears instead. (for example, I created a Simdependence Day. I got a popup that Simdependence Day was happening the next day. But then the next day, Love Day started instea).
It actually looks like my sims get a sad moodlet *every* day about the failed Love Day holiday, but the holiday popup itself only appears when another holiday is on the calendar.
I don't have any mods or cc and I have never used any. I have the latest updated version, but this actually started some time ago (I'm only just getting to reporting the bug now because I've been sort of off and on about playing lately and busy. So basically I'm not sure exactly when this started since my playing has been sporadic until recently)
Edit By Crinrict: Added pack tag to title.