Your responsibility as a dinner guest in someone's home is not just to show up and eat the food. Your responsibility is to be a charming guest and keep up the conversation at the table...not the texting conversation under the table. Scan newspapers and online news the day of the dinner party, to be up on current events. (So even if you are not a sports fan, know how well the hometown team is doing!)
Not sure what to say? The best conversationalists are listeners. Ask questions of the others. If someone is not talking, invite him or her into the conversation with a question. Change topics to make others feel included.
Thank you to the wonderful folks at the Culture & Manners Institute for sharing their wisdom!