Keep in mind that the guests of honor should be given the seats that command the most elegant or interesting view of the dining room. At a small party you can tell friends where to sit or let them select their own seating. For very large dinner parties, placecards will guide guests to the places at the table where they will sit. Be sure names are spelled correctly on the place cards, and then check to see that the caterer has centered the cards behind each place setting. Finally, check with your caterer in advance so that he knows that the place cards should be removed once everyone has been seated.
Music is as critical to a catered party as flowers or lighting.
At home, your best bet is recorded music because you have greater control in the selection of music and the volume of the sound. Remember that music is best during cocktails and then again only after dinner, but not during the meal which should stand on its own. Whatever you decide, keep the sound level at a civilized level so that a chance for conversation still exists. Whether music is from a stereo or a live band, there should be enough different styles available to switch back and forth to change the mood of the party. Having a pianist or a guitarist is an expensive but nice touch, so long as his or her virtuosity does not dominate the party.