This bug was originally reported back in Jan 2022 but still hasn't been fixed.
The University that was in the calandar I think for the xmas 2021 event cannot be upgraded as it says you need more than 50 achievement points from the Easter event of 2017. I only joined on this server in 2020!
Here is a screen print
https://prnt.sc/FD5MKmQ5Ws81
