My mil invited 25 extra people to my wedding.....18 of them said yes......

My wedding is 09/22/19. I honestly just need to vent. I am so frustrated and anxious. My original plan for the wedding was ruined because my FMIL threatened my fiance that she would not come to the wedding if we didn't invite her sister's ENTIRE family. This would make our ideal 50 number of guests into over 75. My fiance panicked and told her to see how many would come...WITHOUT TELLING ME FIRST. My fiance is Albanian and weddings are HUGE in their tradition so of course if we didn't invite them, it would be a travesty and betrayal. They swore that only a few would come because they never travel for anything. I just found out today that 18 of those people said yes. My mom is upset because we couldn't invite all of my side to keep the wedding small so i told her to invite some more of my side. It's unfortunately a huge imbalance of family members. My MIL and Mother are not speaking right now. My space for the reception is tiny. Our coordinator said it was definitely doable, but we would have to do a mix of cocktail tables and round dinner tables. Some people will be sitting and most people will be standing up. It will be super tight. I know it will be okay, but I really needed to let it out. I am anxious because I don't know these people and there will be a language barrier. I also know that albanians are used to giant parties for weddings, which ours is not. I am also upset that my original plan of everyone sitting together for dinner can no longer happen due to the 18 extra people coming to my wedding. I think I just need some good energy. It's good that my fiance will be all worth this. He is a wonderful man and I am excited to marry him. Let's hope for the best.