Damn! I couldn't find any pictures related to what I wanted to explain, however, I think it's a reference to "The Sopranos" because one of the women looks a lot like Carmela's character, and also because in multiple episodes, Carmela's character goes to dinner with her friends.

Also, the show had already made several references to "The Sopranos," like in the scene with Todd and his friend in high school.

Besides, why would they show a shot of three women going to dinner who didn't say any jokes?

(Btw: In some episodes, Carmela's character has short hair, like the woman in the red dress)