Emily was there with Kate! She's thrilled for her favorite boss and had a lovely time throughout the evening dancing with Kate (and anyone else who needed a partner), drinking, and probably crying a bit. She loves weddings, okay?
Emmeline was giddy and having the best time. She tried to personally chat with everyone who attended and gave out so many hugs. She jumped up on stage to sing along with the band at least twice, lost her shoes at some point after she took them off to dance, and used the opportunity to refer to Carol as her wife as many times as possible!
Enzo was there with Bonnie! He's a big softie at heart who loves romance, so he had a wonderful time, made heart eyes at Bonnie the whole time, and danced a whole lot.
Francis was dateless, but was likely hanging around James/Torunn/Tony/Pepper/Kate/Bobbi at various points throughout the night. He's happy for the newlyweds, but was totally there for the food. He danced a bit as the night went on, because he has very bossy people in his life who probably made him.
James came along with Lily. As she and Marlene were busy with bridesmaid type things with Emmeline, he probably spent a good deal of time close to Remus during the earlier festivities. He also walked Emme down the aisle and made a few good natured threats to Carol before heading back to his seat. He would have given a speech filled with many embarrassing stories about Emmeline in school, and danced with his lovely wife, Marlene, Emmeline, Carol, and anyone else who would have him.
Natasha came with Steve! She and Carol are thankfully past their ~awkward stage~ so everything was lovely and nice. She probably got a little misty-eyed during the ceremony and gave the newlyweds a thoughtful speech during the toasts. She most certainly danced with all of the Avengers & Co during the reception and was a bit more overly affectionate with everyone than she usually is.
Tony was in semi-host mode, making sure everything around the mansion was running smoothly for the day. Prior to the ceremony starting, he pulled Carol aside and gave her a very sweet and sentimental speech about how much he loves her and how happy he is for her. He has emotions sometimes. He walked Carol down the aisle! And obviously there was so much dancing during the reception, though.