For anyone interested, I compulsively tried to reserve a slot start of January as suggested for font de gaume this summer and got this response:
La bonne conservation de ce Site prestigieux et le maintien de son ouverture au public sont directement liés au nombre de visiteurs. Il importe donc, selon les conditions météorologiques, d’en moduler la limitation.
Les réservations pour 2018, ne seront plus effetuées.
Nous espérons, par cette information, avoir répondu à vos interrogations . Nous vous remercions de votre aimable compréhension qui contribue à la préservation de ce patrimoine culturel exceptionnel.
La mise en vente des billets se fera à 9H30 à la billetterie de Font de Gaume pour chaque jour dans la limite des places disponibles.
Thank heavens for google translate:
The good conservation of this prestigious site and the maintenance of its opening to the public are directly related to the number of visitors. It is therefore important, depending on weather conditions, to modulate the limitation.
Reservations for 2018 will no longer be effective.
We hope, by this information, to have answered your questions. We thank you for your kind understanding that contributes to the preservation of this exceptional cultural heritage.
Ticket sales will be at 9.30 am at the ticket office in Font de Gaume for each day, subject to availability.
So I guess we will probably just try to get there early and see what happens!
This is my first post on this forum and I get so much useful info from reading I figured I’d share what I learned too. :)