Groan ... I thought this kind of thing had had it's day, but no, my work want me to organise something.
I'm familiar with MS Teams, and I've been googling - discovered 'together mode' which sounds quite interesting and also break out rooms (which I've used before).
They'll be approx 60 of us ... would we need break out rooms for that, is 60 too many at once if we don't? Any ideas what to do, rather than sitting aimlessly with a glass in front of a screen, talking over each other ... at least that'll be an improvement on warm cheap plonk in a plastic cup in a conference room 