I recently went thru a similar situation. My daughters baby shower was given by the baby's dad's sister. Only had met her once and knew the rest of her family would be there. I agonized it from the time I was told about it. Somehow I got thru it and was able to meet the rest of their family. This helped a lot because Tuesday we all were together again for the birth of my beautiful grand daughter. My advice is to take it hour by hour and if needed take small breaks. Good luck hope it goes well.