Up to 8 hours before serving, make the batch. Pour Aperol, Campari, vermouth, and chilled wine into a 2-quart pitcher. If not serving immediately, seal well, covering with plastic wrap if needed, and refrigerate.
Up to 2 hours before serving, stir chilled apricot juice into pitcher mix. Prepare and add grapefruit juice, then stir and reseal, returning pitcher to refrigerator if not serving immediately.
To serve, add grapefruit and apricot slices, if desired, and stir well. Fill pitcher with ice and stir gently until outside of pitcher is cool. Serve immediately in ice-filled rocks glasses or wineglasses. Offer chilled seltzer to top off the drink, if desired.