The Queensland Herbarium holds monthly seminars at their Mt Coot-tha facility and they are open to the public. Their website currently outlines the seminars for 2012 through to June. These are held on the second week of each month between 12 and 1pm.
Seminars that have been announced so far include:
"The flora of the Desert Uplands Bioregion."
"Historical vegetation changes to the grassy islands in the Whitsunday."
"The Springbrook wireless sensor network."
"Priority threat management to protect Kimberley wildlife."
"The fauna of forest red gum ecosystems following the raising of Awoonga Dam near Gladstone."
Maybe you might find some of these topics of interest, so make some time to learn from some of Queensland's researchers.