Dictionary.com/postprandial:

postprandial (post-PRAN-dee-uhl) adjective

Following a meal, especially dinner

Source: The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2000 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.

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adj : following a meal (especially dinner); “his postprandial cigar”; “took a postprandial walk” [ant: preprandial]

Source: WordNet ® 2.0, © 2003 Princeton University

As many of us will probably eat a family dinner or supper together it makes me wonder what postprandial activities will make their way into our traditions.