On the occasion of the Christmas season, Raymond PA5DX, Wijnand PD8DX and Ramona PD9YL will activate three special callsigns: PA21XMAS, PD21SANTA and PD22HNY
The three stations will be active from December 1, 2021, to January 31, 2022, both on the HF bands and at 70 cm and 2 meters using FT4, FT8 and SSB.
Radio amateurs who work at least two of the three special stations are eligible for a certificate.
See their QRZ page:
Source VERON https://IARU-Netherlands