Moduli stack of curves and principal bundles

We will give an introduction to algebraic stacks and Deligne-Mumford Stacks. As examples, we will talk about moduli spaces of curves and moduli stacks of principle bundles over curves. The references are http://www.math.missouri.edu/~edidin/Papers/mfile.pdf http://www.math.ubc.ca/~behrend/thesis.pdf