Most of the champagne vineyards are in close proximity to Reims and Epernay, so that limits you to those two airfields. Reims-
Champagne (LFSR) is first and foremost a French Air Force base (Base Aerienne 112) therefore private light aircraft are never really welcome there!
For GA traffic, head to Reims-Prunay (LFQA), SE of the city. (Incidentally, that's where the Reims-Aviation facility is located). It has an AFIS but out of hours, this reverts to A/A therefore all comms have to be made in French. Same goes for Epernay (LFSW), 10nm South, which uses the common frequency 123.5 (or Unicom as the Yanks call it); all auto-info and circuit calls in French.
Check out the French AIP website for relevant airfield charts:
SIA - La référence en information aéronautique
Cheers
