Missy's PETER was there with Sabrina, thrilled to be invited. He would have just signed his name to whatever card attached to whatever gifts they were giving... because he was a teenage boy and didn't have enough foresight to grab something ahead of time.
SHARON was happy to be there, too. It was only a week or so after her return through the portal, and she was still recovering from the gunshot wound, so she moved slowly, took it easy, and gave big hugs to the happy couple. Thankfully she had purchased a gift off of Wanda and Vision's Wedding Registry before her five year trip through the portal, so it was ready for them now.
CATH made the cake. And it was an absolutely fantastic cake. She had done some of her best work, and scored an invitation. It was a beautiful wedding. Cath was super excited to dance at the wedding reception!
HENRY sat with Jemma and Fitz during the wedding and reception, and definitely danced with Ayla. A lot.
STEVE stood by Vision's side during the ceremony as one of his groomsmen. He might have shed a couple of tears during the absolutely beautiful ceremony, and then took up residence by his boyfriend's side during the reception.
KATE wasn't super huge on weddings. They reminded her of the first time she put on the Hawkeye mantle... kindasorta. But she was there to support Wanda and Vision. And she could be there to help "babysit" Tommy and Billy so that Wanda and Vision could have time to themselves during the reception. (She'd have a dance with each of them, if they wanted it!)
YELENA was there, too, which might have been a small surprise. She figured that she should be there both for Natasha and her friends... but also to be part of the community. Besides, there would be drinks and cake and dancing? She couldn't say no to that!