The Regional PTQ for the first Pro Tour of 2016 will be held on October 31st for North America. The format will be Modern Constructed.
The closest Regional PTQ for Arizona will be hosted by San Diego Games and Comics, located at 9910 Mira Mesa Blvd, San Diego, California and Enchanted Grounds, located at 8800 South Colorado Boulevard, Highlands Ranch, Colorado.
The PPTQ schedule for this Regional PTQ will be from June 6th, 2015 to August 16, 2015. The full details will be announced later.
See the full page here: http://magic.wizards.com/en/protour/rptq1st16