A tea dance is a chance to transport guests to a time somewhere in the past--a perfect opportunity to employ an imaginative historical theme (Victorian era or the roaring twenties, for example). A light buffet and light wines, sherry, and champagne can be served in place of tea sandwiches, tea, and coffee. The party should last about three hours. Sunday afternoon is a pleasant time for a tea dance from 3:00 to 7:00 P.M.