That's a meeting which if you respect free speech is not an issue, even if you dont agree with the intent of the meeting.
The Government guidance is about networks, whether in or outside of work hours, effectively becoming a lobby group that then distorts the work environment for example insisting that everyone has to declare a gender identity, and denying that sex is a biological fact.
And because of the result of the work place not being able to recognise that, is how the SEEN got set up.