At the end of each year, ENTSOG publishes the CAM Network Code transport capacity "Auction Calendar" for the following gas year. All calendars are available on the ENTSOG website.
The auction calendar contains all relevant dates for auctions of standard transport capacity products at interconnection points.
Here is the 2022/23 updated auction calendar:
Note: the quarters of the quarterly auctions are to be interpreted in gas year and not calendar year.
Q1 = October-January; Q2 = January-April; Q3 = April-July; Q4 = July-October
Attached is the official CAM NC auction calendar published by ENTSOG.