gRegorWas going to say, I don't see a btrem user, so must be different. Years ago account creation was open, but lots of spam, so with the MediaWiki upgrade a couple years ago we limited it to admins creating accounts
btremgRegor: Not that it matters much, but.... Looks like my first contribution was December 2020, and it was to work on h-menu (which died on the vine, as it were). The work was spurred by a discussion here in irc with [tantek], and now that I think about it, I'm reasonably sure that it was he who created my account.
d1my interest, fwiw, is that i maintain the Python vobject module (for parsing vCard and iCalendar data), and the codebase includes a hcalendar output function