Is that a recursive event? Same time every 21st day of the month?

I'll add it in my calendar. Link and https://ical.marudot.com/IcalToPhoneDownload?key=d72f0606-e8f6-4cff-95d1-70efbfa56880 or scan this QR code with your phone to transfer the event data, or directly download the iCal file.

^{Expires: 22/02/2027}