Hi,
I am based just North of brisbane and can happily come and film your workshop tomorrow afternoon/evening (it is currently showing as Fortitude Valley).
Filming workshops, seminars and events has been part of my portfolio for the last 3 years.
What I suggest is since this is a workshop (and I assume more intimate versus a larger event), I would record on two DSLR cameras. This has the added advantage of appearing more 'cinematic' versus traditional ENG/event cameras, giving an extra nice visual aspect to the footage.
I will record the audio on a wireless radio lavalier mic, allowing hands free delivery for your workshop.
Editing would be an additional service, due to the length of the workshop, but if you happy with my footage, I'd be more than happy to chat about that with you.
I'd provide HD footage on a hard drive which would need to be returned once transferred.
Thanks for the consideration - Nick