Best conferences/training/conventions

I am a new consultant. I generally work with small companies, private schools, non-profits and individuals on a variety of issues (training, support, hardware, etc.). I would like to know if there are any conferences, training organizations, or conventions that people would recommend. I have been to Comdex in Chicago, which is great for the speakers and the vendor set-ups (getting to see the latest and greatest up close). Thanks!