I think maybe this happened to me, but I'm still not 100% sure. One of my best friends from college got married on NYE right after we graduated. In CA, where her husband was from. We were from the east coast, and def. invited to the wedding, but the lodging arrangements were never really quite made clear.
Another friend was on the west coast already, on vacation, and I flew out the day of the rehersal dinner - and was staying in the hotel where the reception took place, in a room with this friend, and a second one. No issues there.
Next day dawns, we gather in the ballroom to decorate for the reception, and then get ready for the wedding. at some point, someone, either bride or friend, said we were going to stay at the groom's parent's house that night. Um ok, fine. They "apparently" had said it was ok for us out of towners to stay with them. But this came second hand, so really not sure if we were actually invited, or they felt put on teh spot when asked.
So after the wedding, we go to the house, and as its NYE, plus right after the weddig, the house is full. I ended up sleeping on blankets on the floor in the family room, which was fine, except I was jetlagged and tired and could not go to sleep untl every left after midnight. SO I'm sitting there, trying to stay awak.e to make matters worse, my two friends decided THEY were going to go OUT for NYE, and disappeared. So here I am, with groom's family and friends, knowing no one. VERY awkward.
next day, friends are back, and we are all (family etc) awaiting the B&G. who finally show up in the afternoon, and proceed to open gifts.
At this point, my two friends decided they were going to drive back to San Francisco (we were in N. CA) and try and get on an earlier flight standby. I wasn't leaving until the next day, but I decided I was going to go back to the hotel, and stay there, and leave from there. I was not at all comfortable staying another night in the groom's parent's house.
Thankfully i had my mom's cc, for emergencies, which we deeded this was one, and i got a room, but I still feel badly, 25 years later, as I'm not entirely convinced we were actually INVITED to stay, or someone asked, they felt they obligated.