Re being new to political meetings and getting to speak.
There is a skill/art to getting called. I'm not sure I can completely explain it but I have been to lots of Lib Dem political meetings and this was pretty similar. Although we don't seem to refer to socialism quite as much! 
I thought it was a great meeting and in the context of political meetings it was very respectful.
When I first started going to political meetings I rarely got called to speak, in fact I would rarely put my hand up as i argued myself out of anything i wanted to say or ask - I had the feeling if it wasn't a totally original, ground breaking, worthy of doctoral study insight then I shouldn't say it.
I then noticed over time that the people who were speaking (mainly men) were rarely saying anything original or ground breaking but it didn't stop them voicing their thoughts!
However shaky I felt, I had to speak up because if I didn't put my hand up then they would only blame women not for putting their hand up as the reason we didn't get to speak. It's now rare that If i want to speak at a meeting, I don't speak. That said, if you are particularly anxious about speaking there is no reason you should feel obliged to. Give yourself a break, decide early on you're going to listen, then relax and enjoy!
So, I was not surprised to be called to speak on Tuesday night and I think that was down to experience of these sorts of meetings. I put my hand up straight away, almost before the chair asked and kept it up until I got the mic! And that is basically it, I think. I really was one of the first out of the blocks.
Normally, you're expected in these meetings to frame your comments as a question to the panel. I found it very refreshing at this meeting that this wasn't required - because all I had to do was bear witness. Which was so important because we are all being silenced and I am very angry about that.
My experience is that if you don't put your hand up until half way through or at the end, you are less likely to get to speak. I've not chaired a public meeting but I can imagine you create a virtual queue in your head.
Obviously now I have given away my tactics, chairs will know what I am doing and I will never get to speak again!!