I am involved in the Olympic Torch Relay choir - one of over 500 Canberrans to be singing. There are many children (boys and girls) involved too.
To my knowledge (and I have checked this with the Choir manager), we have not had to undertake any kind of security check at all. On the day of the Torch Relay, we will have a specially marked long sleeved t-shirt to wear which will show us as being part of the choir.
We have been rehearsing since February for this event with one (sometimes 2) group rehearsals each week (totalling some 4-6 hours a week). We have also been allocated "home work" and I'm sure many people have been practising daily as some of the pieces are technically very difficult.
We will be performing at the National Autumn Balloon Spectacular on 19th April, near the large pond near Old Parliament House at 7:45am. On the 24th our day starts even earlier (from 6:30am

) and we will be performing at 8am at the Pre-launch and at 8:45am at the end of the Launching Ceremony. Our choir responsibilities continue through the day. Our early morning section will be on breakfast TV - we are being told it will be the Sunrise show.
I would be surprised if any of the choir members is comfortable with human rights abuses etc. Our purpose is not to support what is happening in China and Tibet. We are show casing Canberra to the rest of the World and sing some beautiful and rousing songs. The Olympics transcend national borders. People can protest if they wish; such is their right in our democratic country.
I do hope it is a wonderful day. I'm looking forward to it with some trepidation and excitement as I'm unsure how it will all go after having seen previous torch relays in other countries.
Hope this clarifies some matters with regard to the choir. The Fireworks will be after I'm up, I'm sure and lucky to those who get a long lie. I have a 16 month old to get organised and out the door by 6am, so I'm not sure how that yet will work.
Alison