This is also happening to me.
Just today I was playing and got an invite to go on a date to the Rattlesnake Juice bar. Upon accepting, I was instead at The Roadstead retail lot with not a whole lot to do. This was not the only occurrence for me, and every time the sims arrive at a completely random lot different from the one mentioned in the invite. It has happened on multiple occasions, and doesn't seem to be limited to type of lot or even specific lots. They all seem equally affected and chosen at random (as far as I can tell.) One time I was invited to a nightclub and arrived at a pool.
I'm not sure if it's related, but I also have been getting an issue where, when accepting a social event sparked by an "emotional text" (i.e. a flirty text and the resulting, "Want to grab some drinks?" invite,) the NPC sims will appear at the lot for only a second or two, with no Group indicator token above their head, and vanish from the lot, along with the social event indicator/timer disappearing. This seems to happen consistently, and appears to happen in tandem with the previous bug, where the lot your sim appears at is different than the one mentioned in the invite. (Note that this happens even if the sim has no reason for leaving, i.e. job, school, critical energy/hunger, etc.)
I will say that whenever I am invited to dinner, I do at least appear at the restaurant, and the NPC sim will have the group token as expected, and will remain until the meal is complete and paid for. However, I only have one restaurant venue in my game currently, so perhaps that has something to do with it. Maybe the restaurant would end up being random, too, if I had multiple restaurant lots in my file. It would require testing, which I'm honestly not in the mood to do.
