I think you are justifiably upset, but I also think I would let this slide. I agree with the posters who said travel arrangements are up to you. I think it would have been nice for your friends to show more concern for you, but I also know that not everyone "gets" that this is a big deal to you. I know for me, I would probably have shown you more concern but frankly I would be inwardly thinking, "why can't she figure this out and do it on her own?"
Sorry this happened for you.
The OP could figure out how to get to and from the original restaurant. However, she didn't know the location of the new restaurant, so how was she to get there, unless someone from the group could give her directions? Not everyone has a smartphone. Not everyone has instant access to street maps--if I knew how to get to and from my destination, I wouldn't bring a map along with me. Maybe her city does have maps for free or cheap, but was she near any place that had the maps?
Once the plans changed, the OP did not know how to get to the restaurant from where she was. Again, she might have been able to get to the new restaurant from her home, but still not known how to get there from elsewhere in the city. She's not a resident of the city; she just lives nearby. There are plenty of places I can tell you how to get to from my home, but I'd have to stop and think about how to get there from work, or my sister's house, or another city.
The sisters in charge of the group could have been a bit more helpful, seeing as they were the ones in charge of the plans. I could understand if the OP couldn't find the original restaurant, the rest of the group might be a little frustrated, but that wasn't the case. They changed the plans, after leaving the OP waiting at the restaurant, and then got upset because the OP didn't know where the new restaurant was, or how to get home from there.
As for leaving the OP alone in an area where she was uncertain as to how to get home--I went to college in Boston, a fairly large city, and lived there for several years after I graduated. Making sure everyone got home safely was never discussed; it was just something we did. We walked people to subway or bus stops, we called cabs, we walked people home if they lived near enough. But even in the safer areas of the city, if someone wanted an escort home, we made sure they had one, or called a cab or something. We did not leave someone stranded in a strange part of the city at night.