This August we'll be teaching QIIME at two workshops. The first will be at The 26th Jyväskylä Summer School, at the University of Jyväskylä, Finland. Details on this workshop can be found here:
The next will be at the International Society for Microbial Ecology meeting, in Montreal, CA. This will happen on August, 24th (the Wednesday of ISME, which is an open day). Details will follow here later this month.
As always, you can find information on upcoming workshops, or on hosting a workshop at your institution, at http://workshops.qiime.org