Tea parties are best if dishes can be made ahead, requiring as little last minute preparation as possible. These lemon cookies are perfect. The dough can be made up and kept in the refrigerator for a couple of days. The cookies can be baked and frozen for a month or so. After icing them, they will keep in airtight tin for a day or two.
Actually they are very good iced for a week or so, but I recommend icing them no earlier than a day ahead for a special occasion.