Cointreau, orange juice, red wine, and club soda are the key ingredients to this special occasion cocktail.
Combine first 3 ingredients in a large pitcher, stirring until sugar begins to dissolve. Quarter the grapefruit slices to make triangles; add to pitcher with orange slices, ginger slices, and wine. Cover and chill at least 8 hours or overnight.
Add club soda to pitcher just before serving; stir gently.