I went to a great one at the West Auckland Parents Centre when I was pregnant. Cloth Convert was the speaker.
I found it really useful and informative. The demo kit was there and Karen had her hire kit. There were 5 other people there, including a hubby (not mine). Everyone was pregnant.
I thought it was great opportunity to have a look at nappies.
eta. I think it cost about $20, 'cause I'm not a PC member. Which seems expensive?