@ArtMelC here are a few more dining scenes in picture books:
The Prince and the Porker by Peter Bentley, illustrated by David Roberts, has a few dining scenes. Pignatius has a huge appetite.
King Bidgood's in the Bathtub by Audrey Wood, illustrated by Don Wood, is a Caldecott Honor book with a decadent dining scene...in the bathtub!
Tuesday by David Wiesner has a solo dining scene interrupted by flying frogs.
A Sick Day for Amos McGee by Philip C. Stead, illustrated by Erin E. Stead, has a simple scene where everyone is sharing a pot of tea in the kitchen.
Amy Wu and the Perfect Bao by Kat Zhang, illustrated by Charlene Chua, has a few dining scenes. The book is all about cooking (and eating) the perfect bao.
Tea Rex by Molly Idle is about inviting a T-rex over for a tea party.
Knight Owl by Christopher Denise has an impromptu dining scene eating pizza around a fire, if that counts.
Now you have more to add to your list. Hope you have fun researching at the library!