Hi Ken,
I don't know if you'll still be here on Saturday but the BAS have a public viewing night at Mt Cootha.
http://www.bas.asn.au/PublicFieldNights.html
SEQAS hold public nights on Sundays (Urban Observers ) though it's a fair way from the CBD so getting there could be a struggle if no transport.
http://www.seqas.org/
Ken.