A group of men and women are sitting at a table eating and drinking.
A group of men and women are sitting at a table eating and drinking for a birthday party.
Just because a group is sitting at a table, eating a drinking, does not mean that they are there for a birthday party.
It is not always at birthday party people having food at the table
group of men and women sitting at a table eating and drinking doesn't necessarily mean eating and drinking for a birthday party.