It’s come to my attention that there’s a second events calendar. It’s for SAUK (Shodokan Aikido UK), though it overlaps a lot with Sheffield affairs.
This notably includes the Referee Course on the 29th of March – which is free to attend, from 14:00 to 16:00. That isn’t currently on the other calendar (at the time of posting).
Anyway it’s now on the right bar.