The Environmental Science Institute at the University of Texas at Austin offers a variety of educational opportunities, mostly free, in the realm of environmental science. These include brown-bag talks, symposia, seminars and talks. Most are held on the UT campus, so you will need to pay to park in one of the parking garages.
A typical week during the school year will feature several events.
You can find out more and get on the weekly mailing list by visiting the Environmental Science Institute’s website at http://www.esi.utexas.edu/