DEAR MISS MANNERS: I have a number of questions about punches — serving them, rather than throwing them. I have a lovely antique punch bowl I would like to use correctly. Is it proper to serve punch at both afternoon and evening gatherings? May I prepare a nonalcoholic punch, but provide champagne and/or spirits for the guests to add if they wish? Should there be a card or some kind of menu instructing guests on what flavor it is, or what ingredients it contains? Finally, am I obligated to use the teensy-weensy punch cups, or may the punch be ladled into more elegant and generous stemware, su…