To make the Chambord base, combine nectarines, water, sugar, and lavender in a medium saucepan and bring to a boil stirring until sugar dissolves. Reduce heat to a simmer and let cook until fruit is soft, about 5 minutes.
Let cool then transfer mixture to a blender, add Chambord, and blend until smooth. Transfer to a serving pitcher, cover, and chill until cold. You can do this the day before if you’d like.
Arrange all the elements on a table or bar for everyone to help themselves.
To make a drink, add a few pieces of ice to a wine glass. Then add 1 part Chambord base with 1 part wine and 1 part sparkling juice or ginger beer. Add a few pieces of fruit and some herb leaves, stir and enjoy.