If it is the same group I suspect the snow probably suspended the escalating behaviour
Believe me, you know if you've dealt with Antifa. The flags and hats are your first clue and they're very keen to tell you which group they're with. They won't join a discussion or debate anyone, they just set off fire alarms and try to vandalise the venue. Often a few of them will run around sucker punching people.
All of that being said, their grievances seem to come directly from university campuses so I suspect that they'll be firmly in the corner of trans activities. It wouldn't surprise me if events like WPUK were targeted.