answering my own question, I mistakenly reversed table names.  Here is 
correct, working version:
# Update objectDisplayName in db.SuperObject whenever 
db.Suggestion.suggestionTitle is updated   
def update_SuggestionDisplayName(set, ufields):
   table = 'Suggestion' if ('suggestionTitle' in ufields) else None
   if table:
       name_format = '%(suggestionTitle)s'
       records = set.select()
       for record in records:
           displayName = name_format % record
           ThisSuperObject = db(db.Suggestion.id == 
record.id).select(db.Suggestion.objectID).first()
           db(db.SuperObject.id == 
ThisSuperObject.objectID).update(objectDisplayName=displayName)

db.Suggestion._after_update.append(update_SuggestionDisplayName)


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