Related link: http://www.yapc.org/America/
Yet Another Perl Conference, North American edition, is in Chicago on June 26-28, 2006. They issued their call for participation during the black hole I call December.
Their website has the details of the submission process (i.e. where to send your email) and topics of interest. Since this is Chicago, you’re allowed to vote as many times as you like for your own submission.
Curiously, the first Ruby on Rails conference (RailsConf 2006) is in Chicago on June 22-25. The YAPC folks hope that they can get some of the Ruby people to stick around so they can have some sort of cross-language event.